I second lethal with boost gauge for sure you'll run a ebc or ecu that will have over boost cuts ect built in, in my skyline I never really looked at boost gauge, I also agree with Jmac in race cars u should have a warning or buzzer for oil to save dramas as for something's a lot of after market ecus have dashes to suit with all those readings u need, if this is going to be a big build like you have stated I'd suggest something like that to suit it better