How to test unknown fuel gauge.

Factory specs don't tell you much because the float/ arm may be bent some from "factory." They were not necessarily "that accurate" but "you hope" you can run it down to E and keep going awhile LOL

There's a device.......about 50 bucks.........called a "meter match" can calibrate the thing against some variation. Don't know how far they will compensate

TechnoVersions - MeterMatch for Analog Gauge Correction