Silver threads among the galled... that can ruin one's whole day! I always dab on a bit of anti-seize when using stainless fasteners.
The Wema sensors are great... so far very impressed. Much better than the old noisy swing-arm things, and they play nice with the Maretron TLA-100 module that interfaces them to the NMEA2000 bus. Here's the display that has replaced my clunky old analog gauge with three big honkin' pushbuttons plus one for backlight... the new gauges represent port and starboard wing tanks
at the top, and the larger aft tank at the bottom.