dont waste your money on air/fuel....ge the boost gauge and maybe a Exhaust Temp....with the hondata/bigger injectors your not going to need to monitor your fuel pressure so dont get that. If your going with 3 I would get the oil pressure gauge. Oil pressure is going to play a big roll if you go Turbo. Let me try and tell you why I love my turbo. I'm putting down 254whp at 5psi, Nuff said...heres my dyno:






Stock injectors, Stock motor, vafc, fmu and good tuning......