Installed a Sunpro Voltmeter in the already molested dash cluster. Had to widen the opening for this 2" gauge to replace a 1.75" Ammeter that was there before.
I also cleaned up the cluster harness on the back, removing unused warning lights and water temp leads, then taping it all back up so it's "tidy".
Luckily for me the truck came with an unmolested dash cluster that is fully intact if i ever want to go back to original.