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Hey Sam. Glad you made it.
1. Based on my understanding of how the ECU works, no. The 4/5th/neutral sensors don't affect how your car runs. We have been bypassing them for years with no ill effects.
2. Pipe fittings. Basically anything with the same thread will work. You can run some teflon tape over the threads of the fittings and tighten them.
3. You just have to use a 1/2" ratchet. If you do to manage to get it off, I recommend reusing a transmission or diff drain plug as the filler plug. The drain plug has a magnet and the filler doesn't. There's no harm in putting the drain plug on as the filler for extra protection. The transmission and diff plugs interchange.
If you can't get the filler plug off, you can take off the shifter and fill through there. Just make sure you don't overfill.
Just a little more on #1. I have not yet looked at the ECU source code, and I don't anticipate that I will. So there may be something in the ECU that feeds on these sensors, but so far, we haven't been able to notice a change in engine performance.
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