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Question I have all the components for my 89 TBI to 90 Tuneport swap over including 90 ECM my problem has been finding correct vacuum and electrical schematic. I would appreciate any help you could give on this.

Reply Rae and Steve, I don't think I'm going to be able to help you on this one. We don't have diagrams for a 1990 pickup with TBI. The only thing I could recommend is that if you received these swapover components in a kit, I would go to the manufacturer and request instructions. I'm sorry I couldn't be more helpful. Please write again. Angelo Silverado Auto Service