[dmilzoff]

I have a 1989 944S2 which is dedicated for track use.
The tach works fine for the the first 1 - 3 runs (20-40 minutes) but then stops working. The problem starts with the tach going to 0, then jumping back to normal. After a short time - nothing.
I assume something is getting hot.
What wires should I check?, or do you think it is the tach itself?
The dash has been removed and wires have been changed. I have do problem bringing a new wire to the tach - if I knew from where.

David