Not sure exactly what is involved with the a/f gauge hookup, but you can buy preformed a-pillar pods from Summit or Jegs. Autometer makes them.
I have seen single, double, and triple pod units.
There are also gauge pods for the are between the steering wheel and the dash itself for the new body syle trucks.
'92 Fullsize, swb rc
5.3L/T56 conversion, comp XR275 HR cam .566/.568 lift 222/224 duration 112 lsa, crane dual springs, trick flow push rods, K&N Filter, Nelson Performance tune, Keisler shifter relocation kit, Boyd Coddington Smoothie II 18x8 235/55 up front, 18x10 295/45 out back, 2/4 drop, eaton lsd w/4.56 gears