Factory tachometer reading high - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Kcorey · 03-31-2020, 06:42 AM

Hey guys , I’ve got a 72 k20 with factory tachometer . I rebuild the engine last winter after buying truck , and ever since I installed it my factory tachometer reads roughly 3-400 rpm high at idle . And when I rev the truck up or accelerate , it seems to respond rather quickly ( meaning rpms show they are rising but definitely not matching the actual engine rpms). Just looking for some thoughts , it’s a 350 with a MSD hei distributor . Thanks

03-31-2020, 06:42 AM	#1
Kcorey Registered User Join Date: Jan 2018 Location: Madison CT Posts: 64	Factory tachometer reading high Hey guys , I’ve got a 72 k20 with factory tachometer . I rebuild the engine last winter after buying truck , and ever since I installed it my factory tachometer reads roughly 3-400 rpm high at idle . And when I rev the truck up or accelerate , it seems to respond rather quickly ( meaning rpms show they are rising but definitely not matching the actual engine rpms). Just looking for some thoughts , it’s a 350 with a MSD hei distributor . Thanks __________________ 1970 Chevy c10 SWB twin turbo LS3. 1972 Chevy k20 super cheyenne.



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