well i got really happy cuz i found an oem 1999 cluster for my 1998 gst spyder, so i pop it in and it seems all too easy, then i start it, and the turbo guage(stock one) doesnt work...i mean its pointless, it just goes up n down, + i got a boost gauge, but its not even going up and down like my old cluster, it sorta takes the cake, PLEASE NE SUGGESTIONS....

 

Put your old cluster back in and find a new one. There really is nothing you can do to fix a gauge cluster unless you know alot of the cars electrical system and sensors.