Gauge has a horizontal movement, with the typical Full, 1/2, 1/4, 1/8, black
numbers on white background, everything topped with a red plastic top. It has a
float and the gauge comes in and out with 4 screws on top. Does anyone know what
it's called or where I can get one? Or maybe a replacement float? Of course it
gotta be about 40 years old. Thanks for your help.