This is not meant to act as or replace a proper cylinder head temp sensor
Uses standard GM calibration tables. Here is info for 3 point reference:
-40°F - 100700 Ohms
86°F - 2238 Ohms
This works perfectly as a CTS on an ACVW. As a bonus, it also gives you an idea of what your CHT is. While certainty not as accurate as a proper CHT gauge, it’s comforting to see the indicated temperature go down as cooling fan speed goes up.