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Every setup is different - but for me, I ditched the interior wiring harness all together and plan to utilize a universal "street" kit from Summit (similar to Painless Wiring's kits) which accounts for everything you need (turn signals, brake lights, etc) and then you can wire the gauges up separately.
When I originally swapped over to S5 engine/instrument cluster (was an S4), etc I had to use an S5 dash harness. It was a HUGE PIA to get and to this day my brake light switch never worked correctly nor did the volt gauge?? This is primarily why I'm scrapping all the stock stuff and going custom - just did it with my friend's MG and it turned out great.
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