K5 update... Like I mentioned earlier, the previous owner rewired the entire truck it seems. Whenever a gauge would stop working, he'd just install a stand alone gauge separately. So what I've done is ripped out his extra aftermarket gauges, and got the OEM oil pressure gauge working again thanks to a new sender, and at the same time, replaced the entire cluster with a cluster from a '79 with a factory tachometer. The factory tach was an option from 77-81 and they are extremely hard to find. This allowed me to rip out the aftermarket tach. It took a little modification to work, but it wasn't too bad. The previous owner also wired up a toggle switch for the wipers because the wiper switch in the column was worn out. So I disassembled the column to change that out, and at the same time replaced the stalk, upper steering wheel bearings, and retorqued the tilt screws. This was probably one of the most labor intensive projects I've ever done and hope I never have to do it again. Finally, once all that bullshit was done, I installed 4 new speakers, a new head unit, and a new dash pad to tie it all together. It's coming along...slowly.