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| Factory tach reads half of actual engine speed? |
Subject: Factory tach reads half of actual engine speed?
by draker on 2022/4/2 4:51:13
Hello,
I recently installed a factory tach in my b110. It's working, except for it reads about half the speed of what the engine is actually rotating. If it's idling at 1000rpm, it shows 500. It moves up the range just fine, just reading half speed the whole way. Any idea what would cause this?
I wired it into the stock harness as shown in the wiki.
Ignition system is pertronix, aftermarket coil, and there is a ballast resistor still.
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