you could talk really nicely to empeg folks and see if they could supply an extension cable and then just run that and a arieal cable to behind an easily accessable panal as it is always running the cable which is the biggest pain in the arse. Or you could ask them if it is possible to extend the cables on the harness to reach the final destination of the tuner.

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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland