Looking for a quality liquid filled gauge

Autometer. 5411 or 2603.
If those #s don't work, I'm sure they will have what you need.
(I'm using an Autometer isolator, and a mechanical fuel gauge in the interior.)
Even the quality gauges I I had on the outside cowl would fail at an unacceptable rate. The one on the dash, fed by isolator fluid, is at least fifteen years old, an autometer.