Fuel Gauge

[SkunkBoat]

Doesn't matter how much the tank holds, just the depth of the tank.

Can't you just remove the sending unit with wire still connected
(You need to connect a jumper to ground to get a complete circuit)
, measure the depth of the tank with a ruler, check the swing of the float to see where it gives a full and empty reading, adjust the length of the float arm so that the range corresponds to the tank depth, put it back together?


Sending unit reading is linear. Square/rectangular tank volumes will read correctly.
If its a belly tank it will not be linear because there is more volume in the top half of the tank than in the bottom.