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tacho adjustment for incorrect readings

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hi guys am running a g4 extreme and have had the tacho duty cycle set at 50% and the multipler is set a .88 which gives me a reasonable 100-150 high rpm reading but is 3-400 out down lower in the rangeif I get the idle rpm correct the multipler reads .80 but then I am around 900rpm out at 5-6000rpm

I have read the help file and it says that the multipler should be set at 1 and the tacho duty cycle needs adjusting will the duty cycle correct the rpm reading thru the entire rpm sweep I tried adjusting it some while the engine was reving and didn't see any alteration

any idea's

 

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There is no way to adjust for a non-linear tachometer.  You will have to pick a multiplier that gives you the best compromise of error at high and low RPM.

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