Swapping a 454 in place of the 6.2 in my '83 K20. Can I just unplug the wireing harness from the back of the gauge cluster/printed circuit and plug it into a cluster/printed circuit from a gas truck? Would I have to get one from the same year truck? Can I plug the 6.2 wiring harness into the various new sensors (oil pressure, temp) on the big block and have all the gauges work like they should? (assuming the cluster/printed circuit from a gas truck of course) I want to make this look as factory and neat as possible, so I don't really want a bunch of aftermarket gauges cluttering up the dash. I've already picked up a cluster with a factory tach on Ebay. And just incase, Does anyone have a wiring diagram/schematic for the printed circuit on the back of the cluster?