Tachometer is pegging to 8k every time key is turned on. Is there any test that can be done to confirm it is the tachometer that is no good?

 

 

Sent from my iPhone using Classic Zcar Club mobile

Did it work before and now suddenly went hay wire, or is this the way it has always been?

What year Z are we talking here?

I had a similar thing happen with a 240. It was a pushed in pin on the 4 pin connector at the back of the tach and incorrect wiring at the coil. Short BW to the + coil, long BW and long GW to the ballast resistor (240z only)

Sorry, Joe. I forgot you asked me about testing the tach without the car running.

There is a way that I can think of, but it's not for the faint of heart. It would involve pulling the distributor (or using a junkyard distributor) and spinning it with a drill to provide a signal for the tach. There might be an easier test, but that will have to come from someone else.

Usually, the tach pegging is not a good sign for the tach. (Example: https://www.classiczcars.com/forums/topic/20991-new-tach-problem-240z/) There are places that can repair the innards of gauges. This place is about 6 miles from where I work (though I haven't visited). http://www.hampspeedometer.com/

Thank you for the info guys. It is a 1971 I did put a 123 ignition on it and from what I can remember it worked. I got the car back from paint thought I would hook up some interior things so I turned the key on and that is when I first started noticing the tach pegging out. I will put the old Distributer on the tach to see what happens Steve. Thank you again


Sent from my iPhone using Classic Zcar Club mobile