Thread: Splicing into factory temperature sensor.

Hey guys,

I'm adding some pillar gauges to the car and I'll have oil temp, oil pressure, and vacuum. My head unit runs Torque Pro, which runs about 50 PID per second, so it can basically scan sensors 50 times per second. If I'm able to remove 2 of the sensors from the dashboard as they call it, the remaining gauges will read more often. I'm obviously taking vacuum off, and I'd like to take transmission temperature off. My idea is to have a toggle switch on the oil temperature gauge, to toggle between engine and transmission oil temperature. Anyone know if I can splice into the factory temperature sensor wire to run the gauge? I looked it up in Alldata and there isn't a testing procedure with impedance values or anything, and I haven't found anything in my searches.

No I don't want an Aeroforce, so don't bring that up. I could use an external sender in the top, but it'd be nice to see the same (or similar) values the PCM sees, and the pressure port on the top of the transmission is right by the headers, so there would have to be some heat soak going on there.

Found some stuff in ATSG on it, but I think it'll be about 15*F off. ATSG only gives resistance values at 68*F and Glowshift doesn't provide that low, and 190*F (ATSG says 225-285 Ohms). Glow shift shows 176*F at 224 Ohm. I still might give it a shot just to see how it works out.

Tried with some probes today and it looks promising, until I compared the read to Torque. The Glowshift gauge must back feed a ground because whenever the gauge is connected the PCM value drops to -38.2*F, lol. Now I need to figure out if a diode has any resistance. If it doesn't it'll be an easy fix.