Fox S197 Gauges In Fox Help

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I don't see why the interface unit you posted wouldn't work with the stock VSS in the transmission. That unit would work nicely to calibrate the ppm output of the transmission to work with what the s197 speedometer needs to see in order to read the appropriate speed. That is the information you'll need to know to setup the interface properly: How many ppm your VSS sends based on the plastic gear attached to the VSS and how many ppm the speedometer is calibrated for as well as if it needs an analog or digital signal. Seems like a nifty little device.