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I have done nothing with the pressure switch yet. Looking forward to an answer as you are.
Driveshaft. I took my old driveshaft out of a G35 which they say is non-rebuildable to a local driveline company. They counted the number of splines and came up with a yoke that I believe was for a Nissan truck. Not sure which model. It's a larger diameter yoke which uses a larger U-joint. I needed to trim the metal ring on the trans that the yoke slides in to but after that it fits great. I think it was under $300 to have it made. The rear yoke mates to my Q45 diff. This diff solves several problems.
1. It's cheap and it comes with the right gear ratio for the VQ. The pre 1997 Q45 comes with the stock 3.54 gears that come in the 350Z diff. If you prefer lower gears than stock you can pick up a 1997 or later Q45 diff. I paid $50 for the diff at a U-Pull-It yard.
2. It comes with a speed sensor that can be hooked up to a Dakota digital sensor box to get the speedo to work.
3. I picked up an S15 helical limited slip with stub axles on ebay ($400)that you can use the stock S14 axles instead of the Q45 axles.
3. 4. The brand new balanced driveshaft was under $300.
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