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You probably have your tach set to the wrong PPR (Pulses per revolution). It should be 4.
Read the manual for the gauge, it should tell you how to set it.
Read the manual for the gauge, it should tell you how to set it.
Do not confuse the two. PPR is not the same as "8 cylinder".teddy2heavy said:that is how mine is we have it set on 8 not 4