hi i have just done a conversion of and ef with a t5 behind it into my 75XB and i went to put a tacho on and it reads the wrong revs like when it should be about 4 thou its 1500 i connected it straight to pin 43 or so the tacho wire from the computer is their a way of making it so it reads the revs properly without buyin a 160 dollar box which autometer make to change the ef wavelengths to the ones a tacho reads?? please help i certainly am not buyion that box thanks
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