July 31, 20177 yr comment_527107 The crazy tach sounds like your Pertronix has problems. Try 3800 RPM in the other gears. If it's tied to RPM that's a clue. Same general idea as revving to redline, like Mark M suggested. Link to comment https://www.classiczcars.com/forums/topic/58195-not-run-more-80mph-240z/?&page=2#findComment-527107 Share on other sites More sharing options...
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