Zoeller 004892 Replacement Switch

I replace my sump and drywell pumps every 5 years (Zoeller recommends every 7), but this year in SE MA was extraordinarily wet, lots of ground water, and my 3 year old pumps cycled a lot more than they typically do. I'd rather replace the switches than find next year that I should have. There is a very good reason most of the plumbers around here only use Zoeller pumps. I've replaced a bunch of these, and have read a lot of the reviews. I'm not trying to sound like your mother or a Zoeller attorney, but it seems like a lot of the reviewers are living a little dangerously. In and of themselves, the switches are simple enough to change, 6 screws and 4 spade connectors. However, there is a reason the instruction sheet has things like torque and test pressure setting; you're potentially throwing a toaster into the bathtub if you don't follow ALL of the instructions. The little nylon fitting is 1/8" NPT threaded (National Pipe Taper or National Pipe Thread, depending upon which expert you ask). It isn't metric or ASE, none of them will fit. As #7 on the direction sheet says, tighten it down so "two or less threads are showing". Don't try and re-use the old plastic plug. If you've removed it (7/16" wrench), the threads are probably stripped. You can get the parts to pressure test at most any hardware store. You need a electric meter that reads Ohms to test the through-wall terminals, the two vertical posts on the pump side casting). I hope it goes without saying that the pump should be unplugged during the entire installation. The torque settings (22 inch pounds) keep the pressure uniform over the entire gasket. And make sure you take pictures or make notes about which colored wire goes on which spade connector. I've attached a photo showing which wire goes where; they correspond to the wiring diagram included with the switch. The photos were taken with the pump facing me with the float on my right hand. There are also 3 that show an example of the pressure test setup I use. The one complaint I have with Zoeller is the size of the diagrams. The instruction sheet was obviously written by some engineer, then printed on what I can only assume was a paper saving measure to cram everything the lawyers require onto a single sheet of paper. I have included an enlarged copy of the wiring diagram, which is as simple as these things get. The numbers on the diagram correspond with the numbers on both the switch and the metal casting where the wires attach, along with which color wire goes where. FYI, the diagram apparently covers a bunch of pump models, as the M53 does NOT use a red wire as indicated on the diagram. Where the diagram shows red, it is the white wire on the power in. The electrons don't care what color the wire is.