Hey there, I've had my system stacked and all the bells and whistle going off for 10000mi. I had to put popoff valves inline with the MAP sensor. That stopped the check engine light from coming on. I had the fuel pressure code and the check engine light on after a full throttle run with my Diablo programmer. My super chips doesn't do it. It would be intresting to know what the fuel pressure is at all times. To see it while driving you would have to mount it outside on the hood. I run a ICP controller. The guy I bought mine from has 50000mi on his truck with a chip and the ICP controler. This ICP controller is worth 85hp.