[V8] Tempermental tach and warning light/chime

[Gunter Lorberg]

Another question for the pros....

My other V8 (1990 with auto and 175 000 miles) has a tempermental tachometer and oil pressure warning light/chime.  I guess that I need to know whether I'm likely dealing with the infamous instrument cluster problem that plagues some V8's or something else.  The car runs well, period.  The tachometer sometimes works.  While driving it can alternate between being operational and inoperational without the car missing a beat.....this problem began about 3-6 months ago and seems to becoming more frequent.  The oil pressure warning light/chime has been an intermittent problem now for over a year and may be worsening.  It chirps up frequently.  I have swapped the oil pressure sender with no effect.

Would the car run if the rpm flywheel sensor was failing?  Should I replace that?...or is that a red herring?

If this problem is by far most likely related to the contacts in the instrument cluster, does anyone have access to a write-up on how to tackle this problem so that I can make swift and error-free repairs?......knowing step-by-step how to dismantle the dashboard would be a big plus....

.....still loving the machines and hanging onto them despite being tempted by newer metal....it's amazing how resistant V8's are to corrosion.

Gunter