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Livrat · 01-17-2011, 11:27 PM

I may be wrong but from my experience the factory tachs were not very accurate from the begginning.

I decided one day to test 7 factory tachs side by side, hooked them up one at a time next to a digital tachometer and every one read different.. some way high.. others way low.. only one was close..

I would consider a couple hundred RPM's slow within tolerances.

I view a factory tach as a fancly hole plugger in the center of the dash with a needle that moves and by no means a way to know the real RPM's.

01-17-2011, 11:27 PM	#7
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: WTB - NOS or perfect used tach dash circuit board I may be wrong but from my experience the factory tachs were not very accurate from the begginning. I decided one day to test 7 factory tachs side by side, hooked them up one at a time next to a digital tachometer and every one read different.. some way high.. others way low.. only one was close.. I would consider a couple hundred RPM's slow within tolerances. I view a factory tach as a fancly hole plugger in the center of the dash with a needle that moves and by no means a way to know the real RPM's.