| > Is the water temp sending unit in the water pump housing 
> supposed to be installed as is with just the round gasket, or 
> are you supposed to put some sort of sealer on it?
I'm not sure what round gasket you are talking about, or even what car you
have.  Assuming it's a TR6, then I would suggest a light coat of paste PTFE
pipe sealer on the tapered threads of the sender.  No gasket is required.
> Same question for the thermistat...
There, I like to coat both sides of the gasket with Hylomar.  No need for
anything between the thermostat itself & the housing; as a small leak here
will not hurt anything.
Neither one is really required; but IMO they reduce the chances of a leak
and ease future disassembly.
Randall
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