LOJ is a hall effect sensor (however on the expensive side).
I am going with a Tablet/Bluetooth setup for race display. Also, the vehicle I am targeting has 3/4 channel ABS (the rear diff is actually 2 reluctor wheels on the output shafts tied into one sensor/pickup. Z32 diff btw for reference).
Easy button solution is tapping into the ABS signal and figuring out the wave generation for input paramaters for the ECU (which I am hoping is circulating around on the interwebs)
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