Thread: wondering how many of us are using gps speedos
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Old 07-06-2014, 02:11 AM
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Rob the speedo PPM from the ECU is based on the number of revolutions that your gearbox output shaft is putting out, final calculation depends on diff ratio and tyre size. The speedo should have instructions on how to calibrate it; for some you drive at a known speed (either with GPS on a phone for example, or by driving next to another car travelling at a set speed), or some need you to drive a certain known distance while in calibration mode.

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