Ooltewahman

I do know that the brown wire that goes to the coil does go to the circuit board

The tach hasn't worked since we got the car. I hoped that it would start when I got the new circuit board. The picture of the back of the cluster is just like mine. And thanks for letting me know about the hei. I have a seperate coil. If it doesn't get its power from the circuit board I'm not really sure where it would get its power from. Thanks for ur help

Ok thanks. I checked the continuity to the coil and it was right. Also there is power at the back of the tach. I will order a new tach. I just wasn't sure about needing a filter like I had read. But I don't think I have an hei and I know I don't have the msd ignition. Thanks for helping

I just replaced the circuit board on the gauge cluster. And I traced the brown wire from the harness to see that it was hooked up to the negative side of the coil. This means that the tach itself is bad I'm guessing? Also I read that if u have an hei that it can mess up the tach without a filter on it. I'm sorry to sound like such a novice, but how do I know if I have an hei? Cause I hate to buy a new tach and instantly mess it up. Thanks