Trim Sender impedence range

[bacaruda]

First this is an all new rig. Shortly after starting first outing, the trim gauge shows pegged full up. I pulled sender and checked
sender function. I didn't write down range, but resistance varied smoothly. Next I'll check same from the gauge plug. Looks
like modular plug on back of gauge, not individual wires.
What should the impedance range be?

Thanks,
jim.