You would need the 20V harness, because the 7A motor (I assume you have a 6 Generation Celica) runs on a Map sensor. The silvertop has a MAF sensor and some other sensors that needs to be converted in order to work on the 7A chasis. The swap is not that hard, I did it before on my 7A motor. I don't suggest you to do a Silvertop Swap if you can stick with a 4agze, parts are easier to come by and that supercharger is way better, plus it can handle the boost if you decide to go turbo.
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