Discrepancy between stock tach and aftermarket tach
#1
WRONGLY ACCUSED!
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Discrepancy between stock tach and aftermarket tach
I installed an Autometer shift light which has a digital tach readout in the center of the tach. It is pretty nice.
One problem - the digital tach consistently reads 300 RPMs less than the stock (dash) tach.
I double checked my wiring and settings and everything appears to be correct.
Anyone have any thoughts on the reason for this difference?
Thank you.
One problem - the digital tach consistently reads 300 RPMs less than the stock (dash) tach.
I double checked my wiring and settings and everything appears to be correct.
Anyone have any thoughts on the reason for this difference?
Thank you.
#3
You can always call an AutoMeter rep and ask, they probably get that a lot.
Running it to the limiter isn't the best idea, especially on an unloaded engine.
I think its fine.
However, I'm not an expert, so either call a rep or wait for another response!
Take care!
#4
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#5
Three Wheelin'
My S2 tacho also reads around 200-300 rpm higher than what the real rpm is as logged by my datalogger directly from the DME. I would say the error is with the stock tacho.
#6
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Thanks for the additional input. My tach is wired to the coil, not the DME, so I guess that rules out that variable as well.
#7
Given the other comments, I think the discrepancy is probably normal.
BTW, sending you a PM
Take care!
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#9
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Yep - the stock tach is typically a bit optimistic. I've verified this across both internal DME logging, and external loggers.