hi, sorry if this is a recent post already, I looked around a little but this is a pretty big site-
I had the classic chugging engine/bouncy crazy tach in my 95 accord, so I put in a new ignition coil. Now it runs, thank jesu, but the tach doesn't do anything at all... ideas? Thanks for yr time, if there IS a recent post I didn't see, if I could just be pointed there that would also help! - Katharine

 

Is your 95 accord have a V6 or a 4-cylinder engine? Was the coil outside of the distributor or under the distributor cap?

 

Hi, it's a V6, the coil was under the distributor. Thanks!

 

I just verified the signal to the tachometer is generated by the coil on the 94-97 V6 engine.

A new coil should generate a good signal. It is possible that the coil is defective where it isn't generating the signal and still producing spark. You may want to unplug the electrical connector to the distributor to see if any of the pins in the connector or corroded. The blue wire to the distributor is the wire that carries the tachometer signal to the dash.

The other possibility is the tachometer in the gauge cluster is not functioning properly. This is hard to test unless you have an oscilloscope. I don't think the tachometer signal goes to the PCM, so an obd2 scanner would see the rpm being generated from the crank or cam sensor. The circuit boards on the cluster can get bad solder joints from heating/cooling over time. It is possible that you have this issue.

 

The tach signal wire (blue) also goes to the test connector in the engine bay. It is a pulsed signal. A multi-meter set to AC voltage can detect if there is a signal.