DID YOU NOT READ THIS THREAD??
YOU DO NOT want to put a temp sensor in the LOWER hose, and there IS NO place on the block
The lower hose/ inlet side of the pump is all the "colder" side of the cooling system. You want to measure up top where it has been heated. GM put the sensors in the head starting?? in the 70's ??
Look, you have provided no photos of what you are up against. What brand is the gauge and what do you have for probe adapters? Some gauges can be adapted down to 3/8 pipe thread (about 5/8 OD) but I don't think they can be smaller, for mechanical ones.
