Acquired a discard aerospace hydraulic test mule. (My 1/2T pickup was very unhappy.) One part is a temp gauge and probe.
The center piece is the high-pressure housing that threads into the plumbing. The right is the probe, and the left is the probe retainer.
The probe has a small amount of play - maybe .010 - inside the housing. Do I need to fill the gap with oil or similar to better conduct temp to the probe? (vs. error temp from the wire & fitting) What's the normal method for a doubly-walled piece like this?
I'll be using it for temps around boiling (homebrewing). High pressure isn't necessary but accuracy and response time are important.