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We're on the same thought track. Thanks for being assuring! Confirmed on the STE/ICE. I thought I was going to have to take it for a drive, but it turned out that it gave me the issue right in Park. Using the RPM setting on my voltmeter, it gave consistent numbers at the STE/ICE while the...

Tachometer issue - I didn't remove the radio shelf and the dog house to look into the tachometer connections. Wiring diagrams confirm that the Mechanical Tach wires only feed to the STE/ICE port by the transfer case selector. I might hook up the RPM function of my voltmeter to that and leave...

I'm back at the shop today, so I'll be looking into this issue a bit and sharing findings.

I'm hoping these issues link to the same root cause, so I'm grouping them together. 6.5L GEP engine, 4L80E transmission. I have a tachometer that SOMETIMES acts like this as well as sometimes just pegging all the way at full RPM even though the engine is clearly not at that speed...