[deuce lover]

First,'36 had an electric gauge,Not hydrostatic. Second ,you fill in the brass hex on back of gauge and if the line to the glass tube is clean(incl glass tube) the fluid will appear. Pictured is the back of an orig 32 gas gauge.That thin line must be clear(clean) all the way to the glass tube in the gauge housing.Acetone and or brake clean helps unclogging sometimes.