IS the CPS related to the tach dying? Mine does this now and then....it will just drop, and not reset until the car is shut off and back on again.
Edit: I guess it does. I pulled a TCS light a few months ago, had it reset and it never came back. guess I should get it replaced.
Symptoms of a bad or failed Crankshaft Position Sensor :
No spark at plugs
Engine will run and suddenly die without warning
Engine will not or not easily restart
Tachometer may drop to zero but the car will continue to run, may also result in the TCS light coming on