I only asked about the rings (rotating or spinning on pistons) because the machine shop guy i got new rings from told me they do and i did not know my self.I was always told to to stagger the ring openings when you install them.My shop guy said thats OK but they will not stay in the same place and will rotate or spin for the life of the engine or they stick. the new thermo is i a 180 i think. yet gauge is at 155-160.BAD GAUGE maybe.