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Discussion Starter #1
My new Sun Tach reads at a lower rpm then my meter and my guage tach, about 400 rpm's. It was fine last year and now it seems off, any ideas???
 

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Aftermarket ignition system? If so, I have read that tachs lines/set-ups sometimes need additions.
 

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It could be the OE tachometer reads too fast. I presently have a car with a gauge inst panel as OE equipment and installed an Autometer tach and in comparison to a strobe tach, Autometer tach matches the strobe tach; A/meter = 3K rpm, OE = 4500 rpm.

Visit a diesel repair shop and rent some strobe tach time and operator.
 

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Discussion Starter #4
My OEM dash guage matches my Actron Auto Analyzer, which is new but my Sun Tach is off. It was fine last year though, could it be a ground issue?
Not an aftermarket ignition system.
 
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