Despite my cheery posting earlier hoping that the fuze cleaning process had cured my "bouncing tachometer" problem, my tachometer and oil pressure gauge still have the "yips".

As Gabby had recommended, I cleaned all the fuzes and fuze sockets. I've even cleaned the three fuzes in the top of the Base Module. And for awhile, things seemed to be much better. The oil pressure guage and the tachometer were stable. Then suddenly they got the "yips" again---down to zero for awhile--then back to normal for awhile.

My oil pressure gauge fails the Mode 6 self-test (describe in an earlier post). It goes to zero--when it is supposed to go to the 1/4 gauge level.

I think I'll try the Mode 4 self-test (RPM) and watch until my tach gets the yips and goes to zero. The digital display will confirm that I've still got the TNA (engine speed signal) coming to the instrument cluster. If that happens, then the instrument cluster is going to one of the shops mentioned in this discussion.