I use Torque, not DashCommand, but here is what I can contribute:
I bought an add-on to Torque for Nissans. That tells me that the signals I picked up in the expansion are not provided by the industry "standard" codes.
1) I don't have it either, I suspect it is not on the bus.
2) this was in the expansion for me
3) sorry, haven't looked into those, can't help
4) the 370z has an idiot sensor set to check (I believe) 31psi so it doesn't have an oil pressure gauge in terms of reading multiple values. Personally, I've asked Forged Performance for a quote on replacing the clock with an oil pressure gauge and of course the back end sensor installation and such. They haven't gotten back to me yet.
Good luck
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