I've noticed that the newer replacement ones seem to be a bit less flaky than the older ones. Since roughly 2205-2006. Original stunk, as accurate as a Ouija Board. Replacement reasonable until it got hot, and for good measure started leaking. Third time seems the charm. They are trivially easy to replace thank goodness.
Tried to find the ol POS, but NAPA had two versions in the lower end. The high end echelon is what I have now (5 years old). In the lower end there were two, one was obviously cheap crimped/pot metal with bad machining. The other looked a lot better. It also looks a lot like the ones you find at Autozone, PepBoys, or ORiley's...
I went with the cheaper better looking one and it lasted just a bit more than a year before barfing oil out the connections. Just doesn't pay to save $10 on that part.
Considering how old the Heep is getting I'm going to order new sensors all around. Probably some new harness bits and hardline vac tubing as well. Still cheaper to fix than replace. :) That and who can argue over a $18 tag
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