I've got a line on a 22re that supposedly needs a head gasket. The guy bought the truck for $800 for parts. I was told it might be a 92, I have a 87. Now there was something about a cutoff year were things changed with the 22re? If I remember it was 85 to 91 had the same wiring efi setup? And the TPS was changed to a 3 wire in 92! Am I right? I there any other diference I need to know! Please help me out on this! I might get this motor cheap! If I can get any help on this, it would be awesome!! Thanks!