Cluster with Tacho wiring

[Daytime]

Some of the later GLI's came with the wiring already there just no tacho but this isn't the case for you. You'd have to get the loom from an MR and install it yourself.

Or stick with my first method as you don't need the loom, you just need to run a cable from the cluster then behind the dash to the ecu pin 58(ecu plugs are the yellow ones on the left of the passenger footwell). And then the one from the tach earth screw to bare metal.

 

[Reaper au]

Doesn't the one in the engine bay work? Coz that's the one I'm using now

 

[Reaper au]

Ok so found the problem. I'm not getting tacho signal. I tryed an aftermarket tacho hooked it up to pin 58 and no go. Used a multi meter and nothing come up on pin 58. Any ideas?

 

[kAiDo]

i'll probably be trying this some time next week

 

[jaycderulo]

Hey I have read this whole thread and I went and checked my car and this is the wire I have, Its connector is black instead of blue and the wire is black with a blue stripe.
What does this mean for me? anybody with alot of experience know if a tacho will work off this wire? or am i forced to go to the ECU?

 

[jaycderulo]

Hey I have read this whole thread and I went and checked my car and this is the wire I have, Its connector is black instead of blue and the wire is black with a blue stripe.
What does this mean for me? anybody with alot of experience know if a tacho will work off this wire? or am i forced to go to the ECU?

???????????????????????????

 

[donki]

Hey I have read this whole thread and I went and checked my car and this is the wire I have, Its connector is black instead of blue and the wire is black with a blue stripe.
What does this mean for me? anybody with alot of experience know if a tacho will work off this wire? or am i forced to go to the ECU?

???????????????????????????

13 hour bump, cmon most people will be still asleep (lazy buggers)

That wire should still work

 

[jaycderulo]

13 hour bump, cmon most people will be still asleep (lazy buggers)

That wire should still work

haha sorry for the impatience, there was just a really good deal for a tacho right near me and wanted to make sure it would work first

 

[jaycderulo]

Thanks guys, got it working now i think ill try find a factory cluster because the aftermarket one seems to be distracting over there near the window

 

[HOONIGAN]

...

...

Why do I not have that tach wire. what is the one I have that yours doesn't? Am I going to have to run from the engine bay instead?

Edit: Obviously because the GLI doesn't have a tacho. Duh!

I earthed the new tacho'd cluster and jammed a wire in pin 58 and she works!

 

[HOONIGAN]

So I earthed the tacho and shoved a wire in the empty pin 58 hole and the tacho works. Is there somewhere to get ECu connector/plug pins from or what!??

 

[StuC]

Hey guys, thread dig. I can't find the pinout for the IC 24 pin plug so which is pin 3/4 on that? There are 2 empty pins for what i'd think are 3 and 4 however they do not line up with the IC tracks for tacho. May just be me being a nong.

Also, the single pin in the engine bay - is that on the firewall under the wiper motor? Cheers

 

[Zipper]

Also, the single pin in the engine bay - is that on the firewall under the wiper motor? Cheers

Yes

 

[JoshG123]

Hey Guys, nice little bump for this, basically picked up an MR lancer cluster with tacho. Popped it in, bam! Works, was pumped/shocked, anyway put all the trimming back on and went for a drive.
Then... Problem.. Above 3000RPM the tacho starts to dance, the higher the RPM the more crazy the needle goes.
Added an earth wire to the "tacho earth" on cluster then to chassis (ground) same thing...

I haven't gone and grabbed the signal from the ECU or coil yet as I figured the cars getting a signal to the tacho so if it wasn't id see nothing on the tacho I woud have thought?

Any ideas? Car is a MY02 Mirage.

Cheers.
Josh

 

[donki]

Hey Guys, nice little bump for this, basically picked up an MR lancer cluster with tacho. Popped it in, bam! Works, was pumped/shocked, anyway put all the trimming back on and went for a drive.
Then... Problem.. Above 3000RPM the tacho starts to dance, the higher the RPM the more crazy the needle goes.
Added an earth wire to the "tacho earth" on cluster then to chassis (ground) same thing...

I haven't gone and grabbed the signal from the ECU or coil yet as I figured the cars getting a signal to the tacho so if it wasn't id see nothing on the tacho I woud have thought?

Any ideas? Car is a MY02 Mirage.

Cheers.
Josh

The MR lancer (1.8L) and the Mirage (1.5L) output the tach signal differently, thats why it doesnt work properly

 

[wagonmaster]

Hey Guys, nice little bump for this, basically picked up an MR lancer cluster with tacho. Popped it in, bam! Works, was pumped/shocked, anyway put all the trimming back on and went for a drive.
Then... Problem.. Above 3000RPM the tacho starts to dance, the higher the RPM the more crazy the needle goes.
Added an earth wire to the "tacho earth" on cluster then to chassis (ground) same thing...

I haven't gone and grabbed the signal from the ECU or coil yet as I figured the cars getting a signal to the tacho so if it wasn't id see nothing on the tacho I woud have thought?

Any ideas? Car is a MY02 Mirage.

Cheers.
Josh

Hard to diagnose without seeing it, anyway, have a look on the back of the gauge cluster, #1 is a 4g93 and a #4 is a 4g15. They are not interchangeable, just to make matters more confusing the MR tacho is different again, and it is just as Donki said.

First off i see you added another earth, DID you connect it to the tacho earth point marked on the back of the dash?obviously that did not help, so moving on, do you have an LED test light (the normal filament type draws too much current and wont light up enough) to allow you to test for fast pulses.

Mind you to do all this you will have to isolate the tacho pulse wire in the back plug going to gauge (tacho pulse wire, if one is fitted) i cant remember to well but i think there is a connection point on back of gauge for tacho pulse (I don’t mean the plug)’’
If not cut existing wire in plug that is pulse wire, isolate it/use only to join input wire from following sources.

You could try blue connector (black and white wire) above wiper assembly in rear firewall, is it plugged in or not? If that fails which it prob will, move to next step.

Splice in pin 58 at ECU and try , then if that is a dead end and doesn't work, and this is a long shot by the way, try splicing in wire on output pin from ECU pin 89 (crankshaft sensor) i read somewhere once, might even have been on this forum, that this works a treat when all else fails, i have never tested it or tried it, so can't tell you if its correct or not. (be carefull don't connect wire to circuit marked pulse on back of gauge, i'm pretty sure that is the speed sensor otherwise you might fritz the sensor) then you will have two problems, check fuse 10 as well, works off interior light circuit, guess if lights work than fuse is good.

I'm not sure what harness you have but later gl Gil had tacho harness along with mirages, it unusual for the tacho to jump around like that when you plug in a non tacho harness on an early model(but 4g93 and 4g15 are different, along with MR tacho, so maybe that is the reason.

 

[JoshG123]

Hard to diagnose without seeing it, anyway, have a look on the back of the gauge cluster, #1 is a 4g93 and a #4 is a 4g15. They are not interchangeable, just to make matters more confusing the MR tacho is different again, and it is just as Donki said. This is a number 4 cluster so as you've mentioned it should be for a 4G15.

First off i see you added another earth, DID you connect it to the tacho earth point marked on the back of the dash?obviously that did not help, so moving on, do you have an LED test light (the normal filament type draws too much current and wont light up enough) to allow you to test for fast pulses. Yep, back of the cluster which read "Tacho Earth" then i grounded it. I do have a test light. That's a good idea.

Mind you to do all this you will have to isolate the tacho pulse wire in the back plug going to gauge (tacho pulse wire, if one is fitted) i cant remember to well but i think there is a connection point on back of gauge for tacho pulse (I don’t mean the plug)’’
If not cut existing wire in plug that is pulse wire, isolate it/use only to join input wire from following sources. This is where i'm slightly confused, there is a track on the cluster marked "Pulse" I'm assuming..... This is for the tacho??? - It doesn't state tacho however. Though on the actually plug itself there is definitely a pin for this.

You could try blue connector (black and white wire) above wiper assembly in rear firewall, is it plugged in or not? If that fails which it prob will, move to next step. Blue connector was not plugged in.

Splice in pin 58 at ECU and try , then if that is a dead end and doesn't work, and this is a long shot by the way, try splicing in wire on output pin from ECU pin 89 (crankshaft sensor) i read somewhere once, might even have been on this forum, that this works a treat when all else fails, i have never tested it or tried it, so can't tell you if its correct or not. (be carefull don't connect wire to circuit marked pulse on back of gauge, i'm pretty sure that is the speed sensor otherwise you might fritz the sensor) then you will have two problems, check fuse 10 as well, works off interior light circuit, guess if lights work than fuse is good. Ah right, you mention "Pulse" here so looks like that's not for the tacho? where is the actual tacho signal markings on these clusters? - See my pics added.

I'm not sure what harness you have but later gl Gil had tacho harness along with mirages, it unusual for the tacho to jump around like that when you plug in a non tacho harness on an early model(but 4g93 and 4g15 are different, along with MR tacho, so maybe that is the reason.

- I'm assuming because this was near on plug and play that a MY02 mirage has the tacho harness etc there, as i said it was push cluster in, fire up car, tacho on straight away. just does the needle dance, hence me not being sure if splicing from the ECU and taking out the current signal it's getting is going to do anything, though I'm fine to give this a shot.

My other thoughts were perhaps putting a 10k ohm resistor in line of signal wire and seeing if that calms it down at all.

Thanks for the help so far, really appreciate it.

Photos are of back of cluster, my connector as well. You can see it's got the pins there for at least Tacho Earth.
Cheers.

 

[DrB]

i recall putting a generic tacho on a 1.5 would not work without adding a pullup resistor to the signal line....

 

[wagonmaster]

Yes dash end of harness, the resistor could work, start at 2.5 ohm , 5 , 10 , normally the jumping is either bad earth (double check that with alligator clips to metal mount earth point under dash,and tacho earth point, or incorrect pulse feed, if that does make a difference then try above previous posts suggestions. Best if you had LED test light, multi meter should show enough deflection as well, best test leads to use are the standard multi meter sharp point type, and these sharp pointed piercing type h/d spring loaded connectors pictured, you may have them, im not sure, if not they are invaluable and cheap enough on ebay.

On your gauge, i vaguely remember that the tacho pulse is the 3rd copper foil down just above (or below depending how you hold it) just near the tacho earth writing, the actual tacho earth looks off to the right, 4th foil down, don't have CE wiring diagram to give you pin no/wiring colour.

Try the resistor first idea, think i've seen it done somewhere before?

 

[SDate42]

The MR lancer (1.8L) and the Mirage (1.5L) output the tach signal differently, thats why it doesnt work properly

Yup and the solution is

i recall putting a generic tacho on a 1.5 would not work without adding a pullup resistor to the signal line....

An aftermarket tacho of the time, like the one I have will come with a resistor to suit, many cars of the era had a similar design. I’ll see if I can dig up what size it was - but if you want to know for yourself, sample the 1.8 signal and the 1.5 signal with a scope. From that you can use ohms law to determine the resistor you need.