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S5 and S4 dash harnesses are totally different, you cant just swap in an S5 cluster into an S4 car. You need S5 everything basically. If you have access to S5 cluster, dash harness, logicon, ecu, efi harness, engine and power harness I'd swap it all, otherwise - just use what you've got and keep it s4.
you can use the s5 block w/ s4 manifolds and accessories and efi w/out trouble. The s5 is slightly higher compression which will be a bonus by itself.
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