What we really need Wayne is a super geek. Someone who has a 3D printer and can make us a knob with lighting inside and the word HEAT on the face. I would think that knob would sell all over the vintage world not just old trucks. The thing that struck me about the Ohmite 5150 that I got from Mouser was its completely solid so it is nice and heavy. You have some good ideas there! No surprise!
