Well I went the Blue Chip direction and am very happy I did so, thanks for the recommendation I received the pressure indicator light and new pump yesterday, stared around 6:30 and by 11:00 last night it was running. Chip's instructions were excellent and his products are, in my opinion, the best. The truck runs extremely well and it's apparent after my morning commute mileage is up as well ( I went with Chips modified pump.) Fox, didn't see anything on the coded key you were talking about.