I used a Behr 80C, brand new.

I did test it in boiling water and it did function. I was not checking the temp that it opened at, just that it was not DOA.

I have an Alstrom Imports brand that I got at Napa. I may check that out. I am going to hook up my thermocouple first to get an accurate temp reading. I did not change the temp sensor or check the calibration of the dash gauge.