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Crazy tacho tb42

966 Views 5 Replies 4 Participants Last post by  lucas.bree, 
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I have a 1991 tb42 efi and the tacho is going crazy with the key on reds no engine running it bounces from 0rpm to 6000rpm and back and stops in the middle somtimes.The motor runs fine once you have started it but still the tacho crazys.How do you test the tacho where is the feed coming from is there a general problem these have any help would be good thanx:headwall:
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Tacho feed comes from the coil. I had this problem and found it was a dirty/loose connection from my pertronix to the coil.
Unplug all the ignition connectors and give them a clean. Check the bolts on the back of the coil are all tight.
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