I doubt that it's your gauge/sender.. You can do the "feel" test - you'll be able to tell the difference between 1/3 the way up the scale and 2/3 up the scale.

Checked your plugs? Detonating at all?
Outside of that - have you added anything (like a winch) that would block flow to the radiator?
Running a fan shroud?

22REturbo.net




1988 4Runner
22RTE core, turbocharged, megasquirted...