Hi, friends. I have some problems with the electric temperature sending unit in my 235 engine. My truck is a 1960 C10 with gauges. First, my sensor port is not 1/2 npt. I think it's 3/4, so when I put the NAPA sending unit with the coupling, my gauge show me 175 in top. So the sending unit is not for my gauge. So what is the correct sending unit???

Thanks a lot

Last edited by Gdads51; 09/21/2026 1:23 AM. Reason: edited to clearly indicate the information and questions provided.