Faulty tach.

[Bullitt]

My tach suddently stopped working. Jumps from below zero to 4000. Checked pin 12 and 13 in the cluster with a test light. Everything was ok there. The light got brighter as I floored it. The circuit board in the cluster looks fine (tried with bigger washers around the tach nuts just to check) What is your bet, tach or circuit board? http://cloud.tapatalk.com/s/5cf2827ea8e28/MOV_2013_000.mp4

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[Ron]

Sounds like the tach since #9 feeds the working oil pressure gauge too. But I'd try to check it right off of the tach's terminals...or pull the tach and feed it right off the coil.

Check out this thread:
http://dmctalk.org/showthread.php?8587-Tachometer-Info