I have a broken spoke on the paddlewheel and get no reading on the speedo gauge. Need it for the perfect pass. I see two different speed sensors in the parts catalog. One looks like the through hull (ELECTRICAL - SPEED CONTROL/PERFECT PASS #11 - ~$377) and the other is a small triangular looking thing with a wire(ELECTRICAL - SENSORS #20 ~$132). I haven't been able to get the dratted thing out of the boat to see which one(s) I need. Is there a good way to get that locking nut off the through hull part? Thanks for any help!