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Hi Frans,
I suspect that picture you saw of a coolant tank with a sensor mounted
in it was a modified unit that Cliff Shaw made.  I did something
similar.  I took my tank to the Lincoln Welder demonstration stand
last year at the Oshkosh airshow and had them weld a patch of aluminum
on it to make it thicker so I could put a NPT thread in it.  Although
this approach is more elegant than putting in a T in the host, it does
require a whole lot more effort.
Just as an FYI, Grand Rapids also sell a T along with the appropriate sensor.
Regards,  Paul
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