how to install tachometer.

You should connect the wire (might be yellow) to the #1 coil trigger wire which is the white wire.

Please let us know happens so it will help others.

I found this link helpful.
I have a 1997 Chevy S10 2.2 without a Tach.
I bought another cluster with a Tach in hopes of just plug and play, but after reading this maybe not?
I have not tried to plug and play yet. I was looking at the diagram provided which is helpful and read about the white possibly yellow wire I might need to run.
I am not clear if this wire runs from the back of the connector that the Cluster assembly plugs into, that would make sense but where on the cluster end would that be?
A little more detail on each end needing to be connected would be gratefully appreciated.
I hope to try to plug and play in a few days. we see I guess.

I doubt it will be a plug and play. They did not universalize the harness until later where all options were pre wired.

Roy

Roy,
Thank you, do you have a diagram at the cluster connector where the wire goes?

White wire from ignition coil. diagram attached

Roy

Roy,

Thank You again.
I have a friend whos a certified BMW and GMC mechanic coming to visit Tuesday. I will let him look at the diagrams and hopefully fix me up.
I WILL UPDATE THE RESULTS HERE AFTER HE IS DONE.
CHEVYROCKS

your welcome. We are here to help

Roy

I tried to hook my tach up to the white wire and I get nothing. I read somewhere I may need a different tach

Ok, where did you hook up the tach wire?? did you ground the tach as well??

Roy

I have a good ground hooked up. I have tried it on the white wire on the ICM. I used the inline splice.

I guess I am not even sure at this point if the tach even works. The illumination comes on when I start the truck but no needle movement.

Attached is the diagram for the tach.

is there a pink wire at the module??

Roy

I believe the pink wire is on the plug with two wires in it

2 wires??? that may go back to the instrument cluster connector. that means it is in the harness that connects to the dash.

connector diagram attached. pin 8

Roy

This is one plug

This is the other connector

which white wire did you connect it to??

Roy

White wire on the end

Am I supposed to splice it or cut it out and just have it going to the tach

you are supposed to tie into it. if you cut it out, it would run only on 2 cylinders

Roy

Ok I tried tying into it...I just didn’t get any movement from the tach

I mentioned before about going to the back of the dash for the wire. I would try that. if it still does not work, then your tach is no good.

Roy

How would I test the tach to make sure it worked other than power, ground and illum

The only way is to check it on another car.

it sounds like your tach is the issue here. it is not processing the signal

Roy

Thank you for your help sir

No problem. glad to help

Roy