sawbuck - the wire to the fuse box is where the circuit gets power [+], the wire to the sender [from the gauge] is the ground [-], flow in the circuit [controlled by the variable resistance to ground] of the sender is reading on the gauge
"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
