This is the rough sketch of the wiring. The sensors either directly read the line (Tachometer & Airspeed) or use a voltage splitter to turn a variable resistance into voltage. I'll provide the resistances in a later post after I've tested them.
The top terminal is ground & tachometer input
The bottom terminal is system voltage (9-16vdc), airspeed sensor, oil temp and oil pressure respectively.
On the I2C, Yellow is SCL (pin 3 on Pro Micro) and Orange is SDA (pin 2 on Pro Micro)
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