Looking for oil tank float guage but can't seem to find anything like it..

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.
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Try here
https://keithspecialty.com/hvac.oil_tanks.htm
http://www.jmesales.com/catalog/tank-gauges-alarms,7314.htm
or use google to find oil tank guage.
Roanin

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