Please do look for the temp gauge guy’s info for me.
Was just thinking about a thin, red ‘COB’ chip-on-board LED arrangement that could supplant the tube in the gauge. Unlike individual LEDs, a COB can be in the shape of a solid bar. Google it and you’ll see what I mean. The circuit to drive this as a fuel level or water temp isn’t a big deal. Just thinkin’ out loud here.