Ayuh,.... This is a side loop of wirin',.... The Up circuit from the switch at the handle goes through the limit switch, back to the pump,....
The Trailer switch, just by-passes the limit switch circuit, 'n goes directly to the pump,....
If the sender quit, Don't worry 'bout it,.... It'll all still be there when ya decide to fix it,...
It ain't hurtin' nothin' the way it is,...
The sender just gives a varyin' ground to the gauge,...
The wires comin' in from the limit switch, 'n sender are just plain ole black wires,...