Any device on tank that relies on pressure to tell you how full tank is is notoriously inaccurate.... Tank pressure is related to temperature.... On a cool morning tank will read low...Late in day as temperature of tank peaks it will read full, With out you drawing off or adding any fuel to tank.
Only way to accurately tell how much volume is in tank is by weight or by temperature....
Propane weighs in at 4.25 pounds per gallon. A #20 tank holds 4.7 gallons of propane.... What you want to calculate is weight of tank and propane... Tank wight (tare) is on tank safety collar and it is "constant" (something like 18 pounds)... So a full tank will weight 18lbs (tank) plus 19.9lbs( propane) for a total of 37.9 lbs.... From there on it is a matter of just doing simple math as to how full tank is.... Old bathroom scales under tank is real good "gauge"..
Second method is temperature.... heat a pan of water to almost boiling and then take it out and drizzle it down side of tank, next run your hand down side of tank where you have drizzled water, the transition point from warm to cold is how full your tank is of liquid.....This method is almost same as "stick on" level indicators that change color to indicate level of fuel in tank...
Dale
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