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69GMCLonghorn · 05-12-2014, 01:50 PM

My tach in my other truck was reading like 3800 RPM at 60 MPH. So (in my ignorance), ordered another one from LMC. That one would read accurate until I was on the freeway for over 10 minutes. Then it would read high again. I had them send me 3 tach's in total and they were all POS's!! I should have either adjusted the first one, or had it rebuilt if it needed it.

05-12-2014, 01:50 PM	#14
69GMCLonghorn Registered User Join Date: Dec 2006 Location: Porter Ranch, CA Posts: 978	Re: Tachometer Calibration/Adjustment ?? My tach in my other truck was reading like 3800 RPM at 60 MPH. So (in my ignorance), ordered another one from LMC. That one would read accurate until I was on the freeway for over 10 minutes. Then it would read high again. I had them send me 3 tach's in total and they were all POS's!! I should have either adjusted the first one, or had it rebuilt if it needed it.