NO pressure gauge will ever tell you how much LIQUID is in the tank, the pressure gauges only say "Full of gas" or "Empty" there is no in between.
Now, Float gauges, like I have,, those tell you the liquid level.
Camping world, Most every BBQ store, Hardwares, Lowes, Home Depot, Wal*Mart _______. all carry an LCD color strip that either has double stick tape backing or magnetic backing.
You attach it to the tank
You put a pan of water on the stove to boil
You pour the hot water over the tape
It tells you where liquid ends and gas begains
Way better than any other gauge made.
Oh, why won't a pressure gauge give you anyting but EMPTY/NOT EMPTY?
Well all it sees is the vapor pressure of the propane, which is a function of how hot it is, not how full it is. Tank full, temp's -45 Pressure = zero
Tank has 3 oz liquid propane, temps 100, full pressure.
Tank has 20 gallons, Temps 100, Full pressure, same as if it had 3 ounces.
That simple.
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Home is where I park it!
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