measure the resistance while moving the float arm over it's full range of travel - should be about 0-30 ohms for an original gauge

the voltage goes to the gauge, not the sender, the sender provides a variable resistance to ground for the gauge

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot