I just bought the sled this way. I got constant CEL light flashing and no factory boost gauge showing up on the gauge cluster. I took it to the dealer to get the codes read, the codes that came up were P1555, P0172, P0234, P0238. I did a lot of reading on this site and the Polaris site. I did the two purple wire ground on the computer. I do get my boost gauge back but it shows full boost sitting idling. I checked all my clamps, checked the boost box for cracks. I'm in the works of getting the parts to make my own code reader and boost leak tester. Does anybody have any ideas? Thanks.