Last night my tach was working fine and has been since I bought the car on Monday. Today I started driving and realized it wasn't working at all! It just sits at 0 and doesn't move. Speedometer works and everything else as well. I'm doing just a bit of research and it seems like it could be the distributor? But if that was the case, would it still start and drive normally without any hesitations or misfires or other problems? Anyone know? And any recommendations on where to get a new one if it is the distributor, because Autozone is anywhere from $220-420.
According to a wiring diagram I found, the tachometer gets an independent signal from the ignition control module inside the distributor via a blue wire. I would start by checking the wiring and the connector at the distributor.
Glad you got it fixed. Sometimes terminals inside connectors can corrode, even though they are supposed to be "weather proof". If you want, you can pack some dielectric grease inside the connector and that will help prevent future corrosion.