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RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

 
 
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Old 09-21-2010, 05:57 PM   #1
adrock
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Erratic tachometer (rpm gauge)

My '93 has an erratic tachometer which jumps 1-2,000 rpms back and forth, but with no change in throttle position, or audible from the engine, or any sense of acceleration. I'm pretty sure its a ghost, and not actually jacking up the RPMs by 2000 in .03 seconds.
Let me give a specific example: cruising at 45mph, 4th gear, 3k rpms... tachometer will suddenly jump to 4k and then drop right back to 3k, like a twitch.

But I yield to those who may know better than I: is this a bug that others have seen? Where should I start looking; gauge cluster or elsewhere?
I can replace the gauge cluster but before I do I'd like to have some sense that the problem is in there (and not in the engine or trani or something)... and I have no intention of letting a mechanic spend 12 hours trying to diagnose it.

What say the experts on here?
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-'94 Rx7 R2, Pettit TKT: SOLD
-'85 Rx7 GSL-SE: SOLD
-'90 Rx7 GTU, stock: SOLD
-'93 Rx7 base: my current baby

Last edited by adrock; 09-22-2010 at 02:46 PM.
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