[Schurkey]

Originally Posted by 64speed

Serious question. If oil filled gauges are not to be trusted

Originally Posted by Schurkey

LIQUID-FILLED fuel pressure gauges are NOT TO BE TRUSTED...

...UNLESS you burp the gauge at every temperature change.

Either pop the rubber plug at every temp change (engine compartment cold vs. hot.) or cut the nipple so the gauge can vent.

Originally Posted by 64speed

then what brand non oil filled gauge doesn’t just bounce around giving you no steady reading at all? I had a Mr Gasket and a Summit gauge before this one and they all just swung around wildly.

Engine-driven fuel pumps supply fuel in pulses. A non-dampened gauge will react to those pulses by showing the true pressure--which will NOT be steady.

Liquid-filling dampens the gauge. There are other ways to dampen gauges beyond liquid-filling them.

Originally Posted by 78w72

Weird, had my dry summit gauge in use for 10+ years, zero bouncing or heat related high readings.

Apparently a dampened gauge but not liquid-filled.