Honda civic del sol rpm meter jumping at around 4k rpm?

My 94 del sol when driven on the highway. After i hit a little over 4 rpm… The needle starts jumping from 4 to maybe 6 but no engine change or high rev. Just the rpm meter and my temperature guage hit cold and kinda bounce up and down at the bottom line. I recently changed my whole distributor for a used one if that help. Any answers would be appreciated.

Make sure the throttle cable and adjustment is good. Most likely it's the IACV since the engine has been driven on the highway like you've said. If it happen when the engine is cold then it's the FICV or the engine has a vacuum leak. Any code? If you need help for IACV or FICV testing: E mail me. HTH

Not vtec, check the wiring around the instrument cluster.

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