Lol..I knew someone was gonna do it.
I'm not so sure about where to draw power for it in the subarus, but I turned the check engine light in my civic into a shift light after I had the p28 ecu kromed, it was part of the tune I got. No wires or anything, could be the same with an aftermarket light. Maybe just run a power wire and relay into the vss since your intake is map based. But idk Alex....maybe?