I put an ARC flat pannel in my car the year befor last and also had the under hood extra switches.

I replaced it last year with the 3700 because with it mounted overhead on the roll cage, you couldn't see what you were trying to turn on without getting in the the car or sticking you head in and looking. With the big switches I can just reach in and feel what switch is what when bumping over the motor or turning the water/fan off after a run.

But the flat pannel system was sweet, just didn't work for me.