Jump to content


Is my tach dead?


Recommended Posts

I am trying to figure out why my tach does not work. From searching I have seen that the green wire from my - term on the coil goes to the tachometer. The tach also has a black (ground) and red/black (12v) wire on the back of it (along with light bulb wires).

I have tested for breakage in the green and black wires and they read fine with the ohm meter. Power reads 12v from the red/black wire and ground.

When the key is on, 12v, when the car is started and idling it drops down to about 6v-7v. When car is fast idled the voltage increases again up to 12v.

With this information, am I believe that my tach is toast? Is there anything else I can test that will give me my answer?

Thanks in advance for the help!


74 260z, bone stock, su carbs.....reentered zland finally! :)

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.