I can tell you why it might have been dissabled, I have contemplated also disabling mine though I would not do it that way. In the case of my engine (4JHTE). I have also have both oil switch, and oil presure sender , and another blank entrance into the oil chamber. My instruments are electronic, and all appear on the plotter, or my computer. So the sender units are different for this. On this engine with those sender units the senders are junk, and at best very tempremental. This first one of these failed scared the sh... out of me as I was probably 600nm from any land motoring wiht maybe 2 knts of wind, and the boat was maybe 12 months old. As soon as I saw the presure drop I turned off the motor and checked as much as I could. Oil presure was dropping down to about 2-4 PSI. Long story short it was lieing, presure was not dropping at all. Four senders later have added a mechanic old style one right at the engine, and pretty much ignore the electronic sender when it has its spassim. It works 99% of the time but that one percent gives my heart a run for its money especialy if Im working in or around coral reefs. They last about 2 years if ya lucky.It maybe in yur case the unit was damaged as someone tried to remove it also. I now carry a two new senders as a matter of course. I would just make sure that the oil switch... not so much oil presure sender, but the swithc one is working 100%. In my cases this is the one that will stop (shutdown) the engine if Im not paying attention to the oil presure. I have tested all my senders and sensorse, neverever let the shut downones not work, as for the oil presure much better to have it of course, but yea I can imagine the temptation to disable it.