I tried searching here and on msextra to figure out what signal is sent from the stock E30 cluster to the ECU, but I'm not finding much and it's kind of hard to test since it requires the vehicle to be moving.
As I understand it, the sensor in the diff is a reed switch which sends a signal to the cluster, which is then conditioned into a square wave pulse with 9 pulses/wheel rev.
My issue is understanding what this "pulse" from the cluster actually is. Is it a switch to ground? Is it a 5 or 12V signal? This matters because it determines which input on the Megasquirt I wire to the signal. The MS3X "Launch In" supports ground switching inputs and the "Nitrous In" supports +12V switching, both are selectable as options in the VSS menu.
As I understand it, the sensor in the diff is a reed switch which sends a signal to the cluster, which is then conditioned into a square wave pulse with 9 pulses/wheel rev.
My issue is understanding what this "pulse" from the cluster actually is. Is it a switch to ground? Is it a 5 or 12V signal? This matters because it determines which input on the Megasquirt I wire to the signal. The MS3X "Launch In" supports ground switching inputs and the "Nitrous In" supports +12V switching, both are selectable as options in the VSS menu.
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