Electronic Ratio Adapter
by Isspro
This device helps obtain speedometer accuracy affected by tire size and rear end ratio changes. Instructions help you calculate percentage of increase or decrease necessary to correct the speedometer accuracy. DIP switches are then set to adjust the signal and calibrate the speedometer. Wiring is 12V DC NG keyed on/off, ground, input signal from magnetic sensor or signal generator and output signal to the speedometer.



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