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R32 GTR Cluster/ECU Readouts?

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Hey all, I'm looking at building a custom display using a few things like Raspberry Pi, Arduino and Qt5; I have built something similar before for our E36 race car, but wanted to know how to interpret the following readings from the car:

  • RPM signal - is this just pulses? And is it 3 pulses per crank revolution?
  • Fuel signal - is this voltage or resistance based (assuming I am tapping the wiring at the back of cluster) ?

I'll use the usual 2-wire RTDs for water and oil temp, and a linear 0.5-4.5V sensor for oil pressure, GPS for speed, and perhaps a MPX5700AP for boost.

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