anyone ever mount gauges on the A pillar?

Looks like you need some fiberglass mat. Make a mold of the a pillar. Put some Vaseline on it, tape up things and then put up some chopped matte. Let dry, clean up the mess and cut one up, then mold it together. One day I'll make one. For now it's on the lists of to-dos. I have a mold for my 65 Valiant rear deck already. Just not enough time to make it an actual piece.