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IMO it's cheaper to buy a boost gauge and find out the wastegate is stuck from it that blowing the motor. same with a wideband for a bad tune. i also think that oil pressure and temp gauges are important because the factory ones are total BS, most of the time they dont do anything unless you have no oil.
I run a bottle pressure and fuel pressure for my nitrous set-up. I really like the bottle pressure gauge because I dont have to pop the trunk to read my bottle pressure, and I can monitor it going down the track to check for sudden pressure drop. Also, I can monitor bottle pressure while the heater is on, so the bottle doesn't over expand.