Sorry to hijack an old thread. I installed my replacement thermostat today, and it is the same temp as the old one (195) except when I tried to screw it in and lock it in place, it did not seem to want to do so. I put a little silicone around the edges and that held it in place while I installed the gasket. Then I held it up against the inlet and screwed the two bolts back in. Is this acceptable or not? I can just as easily take it off and do it again, maybe trying a different brand if necessary. The brand I just installed was a STANT that came up as stock for a 1994 3.8 n/a at Pep Boys. Any advice? Thanks for your help in advance.