If you want to do something different, I replaced all the gauges in the GP dash I swapped into my El Camino with Autometers with a little bit of mods.There’s a long way to go on this one. Just got a 8.5 rear end too.
Would be great to find a set of factory gauges. The goof who owned it before smashed them out with a pry bar. Destroyed the bezel, cut out the brackets for the console, and butchered the wiring under the hood.
Just bought the Haynes manual to help. Any advice would be greatly appreciated.