Oil Pressure/Water Temperature Gauge Voltage Chart

[flightlead404]

Originally Posted by Brewgyver

IIRC, Imperial sending units are reverse acting resistor sensors, with resistance dropping as the variable rises, and I believe both have an operating range of 240 to 33 ohms. Typical Imperial pressure sensor is 240 ohms at 0, 33 ohms at 80 psi. The change of resistance is pretty linear within that range, so the conversion in easily calculated. I would think if you're using a Raspberry Pi or similar unit, should be easy enough to connect the senders to an ADC chip.

or an ATMEL/Arduino or ESP8266/32 or something. Signal K to dashboard, or even output onto your NMEA devicenet backbone for display elsewhere?