I wired the black wire to ground. Works as required.I replaced my Dynon oil temp sensor with the 2 wire GRT FT-LC-01 sensor. It has a gray and a black wire. Does anyone know which wire goes to ground? Maybe it doesn’t matter?
I just used a box wrench because the probe is installed with a crush washer, finger tight plus 135 degrees, then safety wired. No leaks after three engine runs. I hope you’ll post what your test lash up reveals.I’m going to test wire it first to be sure. Installing the probe was tricky with the wires exiting the back. I had to notch a socket to allow the wires to exit.