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Question I am installing a 1990 tuned port induction system in a 1989 Chevy truck can you showme the correct locations for electrical and vacuum hook up.

Reply Thanks for writing! Unfortunately, I don't think that your truck was offered in 1989 with TPI. All were throttle body. You may run into problems with smog laws (these vary from state to state), not to mention that you will need a completely different ECM, wiring harness, and other accessories. Since they didn't offer a 1989 pickup with TPI, you will have a hard time finding OE parts that will give you the desired performance and economy. You may not want to undertake this project. I hope I've been of some help. Let us know how it turns out. Angelo Silverado Auto Service