Installed a new VDO coolant temperature sending unit. This one both measures the water temperature and sets off an alarm above 205°F. The sensor is grounded to the engine through the threads so no teflon tape was used. Hopefully the MPT fitting alone is enough to stop any leaks.
VDO 323-098 - 1/2-14 NPT - Spade - 205F+/-5F - Single Channel 250F / 120C Temperature Sender
The cooling system was drained of about four gallons of antifreeze before the old sensor was removed. Removing this much antifreeze and then replacing it is invariably a messy job.
The new sending unit is about 1/2" longer than the one it's replacing. It's long enough that I worried about it bottoming out on the thermostat. A few measurements showed that as long as four threads could be seen on the installed sending unit, there would be clearance between the bottom of the sending unit and the thermostat.
All that remains now is to start the engine, check for coolant leaks, and confirm the temperature gauge works.
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