Tachometer of 1992 S-10 Blazer (digital dash) has started to act quite
strangely. It sometimes works properly, sometimes blinks, sometimes goes
totally blank and sometimes shows full rpm even on idle.
Now, I don't have decent manual or much experience with electronics.
Would anybody be able to point out what to check. I think it could be
some electronic component in dash about to give up but before I rip the
dash open I would like to hear your opinion what might cause such
If someone knows how the meter reads the rpm from the engine and can
point me to check proper wires/connectors I would be extremely happy.