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**clemdaddy** · 07-16-2015, 09:39 AM

yeah i thought that might be it but what are the chances that two different tachs are giving the same slow reading and both need calibration.

the transmitter for the older tachs have a set screw for adjustment but i haven't tried messing with one of those. also it seems that most factory tachs came in the bigger trucks and most of them ran a six cylinder for the torgue. so, theastronaut may be right that these are both 6 cylinder tachs.

i love a mystery and will eventually get to the bottom...

thanks for the input...

07-16-2015, 09:39 AM	#9
clemdaddy Senior Member Join Date: Oct 2009 Location: Fayetteville, Arkansas Posts: 1,932	Re: factory tach yeah i thought that might be it but what are the chances that two different tachs are giving the same slow reading and both need calibration. the transmitter for the older tachs have a set screw for adjustment but i haven't tried messing with one of those. also it seems that most factory tachs came in the bigger trucks and most of them ran a six cylinder for the torgue. so, theastronaut may be right that these are both 6 cylinder tachs. i love a mystery and will eventually get to the bottom... thanks for the input...