Cluster with Tacho wiring

Hey All,

Thanks for the help so far.

So today i had another crack, took the signal from the blue connector in engine bay, also made another ground and checked it. This worked obviously though i still have the same issues with the bouncing tacho with load/past "4k" RPM.
Then i decided to throw a resistor in, started at 10k, then 5k, then 2.5k, then 2.0k then 1.4k was the lowset i could go with the 10k's setup in parallel as i ran out of them haha. I will buy a 1k pack of 8 tomorrow and keep going lower.
I guess my last crack after the resistors will be to use the crank signal and see what i get out of that...

If that all fails, will just leave it haha.

Cheers!
Josh.
 
DrB said:
how did you wire the resistor?
in series with the signal or as a pull up?
Click to expand...
In series with the signal, I'm thinking that's not what i should do here?
If running the resistor as a pull up, where does the voltage source come from? is it 12V that i need?

Correct me if i'm wrong, connector 1 side of resistor into tacho signal then the other side to a 12volt ignition source?

Though, i would have figured this would be needed if it didn't work at all, not to resolve an issue above 3000RPM and on high load (dancing needle)

Thanks again!
 
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JoshG123 said:
In series with the signal, I'm thinking that's not what i should do here?
If running the resistor as a pull up, where does the voltage source come from? is it 12V that i need?

Correct me if i'm wrong, connector 1 side of resistor into tacho signal then the other side to a 12volt ignition source?

Though, i would have figured this would be needed if it didn't work at all, not to resolve an issue above 3000RPM and on high load (dancing needle)

Thanks again!
Click to expand...
You might just have a very weak pullup that sets up a low frequency filter attenuating the signal at 3k to a point where its hard to pick up. might not be it but easy to test, just use your 10k and put it from signal to 12v.
 
I'm going to throw in my $0.02, why not just buy a tacho cluster that'll work in the first place? 1.5l cluster for 1.5L, and 1.8 cluster for the 1.8L? It'd save a tonne of fiddling around, and work as factory
 
donki said:
I'm going to throw in my $0.02, why not just buy a tacho cluster that'll work in the first place? 1.5l cluster for 1.5L, and 1.8 cluster for the 1.8L? It'd save a tonne of fiddling around, and work as factory
Click to expand...
because you can get a resistor for less than 2 cents... lol
 
donki said:
I'm going to throw in my $0.02, why not just buy a tacho cluster that'll work in the first place? 1.5l cluster for 1.5L, and 1.8 cluster for the 1.8L? It'd save a tonne of fiddling around, and work as factory
Click to expand...

As stated before, this is a #4 cluster, which, if my research is correct is a 1.5ltr cluster, the car is also 1.5ltrs - Bit hard to get any closer than that.
 
DrB said:
You might just have a very weak pullup that sets up a low frequency filter attenuating the signal at 3k to a point where its hard to pick up. might not be it but easy to test, just use your 10k and put it from signal to 12v.
Click to expand...

Awesome, thanks again mate. Will try and report back.
 
Update....
So my old man has been in the electronics/electrical field for 40 odd years, he's got a case of circa 1970's resistors, it's pretty funny, anyway he said i could take it, so i started down low at 470ohm's, success! the tacho works, slightly better with the "dancing/jumping" Ok cool getting somewhere, so i grabbed my 1kohm resistor as a sanity check and whacked it back in just incase it was a bad connection (as it gave me a dead tacho) anyway same result dead tacho....
Long story short. I ghetto'd some up to 985ohms - bam tacho works and is smooth as i reckon it's ever going to get, ever so slight barely noticeable jump but whatever it's basically spot on, no idea if it's accurate but close enough!

Thanks to all that helped. Bloody strange, will certainly clean up my "testing setup" and go for some nice small (physically) resistors
 

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Hey guys,

Sorry for the two year thread bump..

But I'm trying to install a tacho cluster into my '01 CE sedan that came factory with no tacho. I've tried to just simply plug and play with no success.

I've got my tacho signal wire coming from pin 58 on the ecu using a vampire clip and tried screwing that onto the back of the cluster with no luck to get it working.

I've also tried to ground the cluster as well as having the signal wire attached with no success.

Does anyone have any idea what the issue might be and or how to get it to successfully work?

Thanks in advance.
 
JacksonRop2442 said:
Hey guys,

Sorry for the two year thread bump..

But I'm trying to install a tacho cluster into my '01 CE sedan that came factory with no tacho. I've tried to just simply plug and play with no success.

I've got my tacho signal wire coming from pin 58 on the ecu using a vampire clip and tried screwing that onto the back of the cluster with no luck to get it working.

I've also tried to ground the cluster as well as having the signal wire attached with no success.

Does anyone have any idea what the issue might be and or how to get it to successfully work?

Thanks in advance.
Click to expand...
Got the exact same problem, can’t find an rpm signal anywhere

EDIT: Found it, spliced into the brown and green wire coming from pin 89 of the eci
 
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Rooster700_0 said:
Got the exact same problem, can’t find an rpm signal anywhere

EDIT: Found it, spliced into the brown and green wire coming from pin 89 of the eci
Click to expand...

Did that work right away with no need to fiddle around? Just wire that straight up to the back of the tacho cluster?

Also how did you get the signal from that wire? Pics would be much appreciated in trying to replicate this..
 
as above the ecu has an open collector fet output that needs a pullup resistor that's in the dash. just wire in a1k ohm pullup resistor to the rpm output and the signal will be there.
 
DrB said:
as above the ecu has an open collector fet output that needs a pullup resistor that's in the dash. just wire in a1k ohm pullup resistor to the rpm output and the signal will be there.
Click to expand...

How might I go about doing that?
 
DrB said:
as above the ecu has an open collector fet output that needs a pullup resistor that's in the dash. just wire in a1k ohm pullup resistor to the rpm output and the signal will be there.
Click to expand...

I tried this today and didn't get tacho output.
 
pin 58 is the tacho signal which needs the pullup. wire pin 58 to the tacho as normal, one side of the resistor on pin 58 and the other to 5v (pin 81).

pin 89 is the crank signal which may work.
 
DrB said:
pin 58 is the tacho signal which needs the pullup. wire pin 58 to the tacho as normal, one side of the resistor on pin 58 and the other to 5v (pin 81).

pin 89 is the crank signal which may work.
Click to expand...

How far from the ecu/cluster should I wire up the pull up resistor? Should I do it at the ecu end or at the cluster end ?
 
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