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Wideband and fuel pressure is more important. you eventually learn your bottle pressures or can mount a gauge on the bottle
But nitrous line pressure at the bottle is not going to be the same at the purge solenoid. Also, if you are driving down the road getting ready to run someone for example, you do not want to be looking back, trying to read a gauge.
That innovate gauge is pretty neat, a lot of their new dual gauges are pretty cool actually, I think. I don't run nitrous, but I went for wideband only. I have the ability the log fuel pressure, but I don't think I need to see it constantly, I am more concerned about AFR on a daily basis. If something is amiss, I can check up on fuel pressure if need be. My 2 cents anyways