Just rewired my 63 K-10, under dash and eng compartment. Ordered from American Auto Wire. Seems my 63 had 62 wiring from the factory. AAW exchanged the harnesses after we figured out why I was having problems with some connectors (blinker sw connector mainly). I think they were cheaper than LMC. Up and running. Watch your ampmeter wires as they are not fused and tend to burn up a complete wiring harness if it shorts out.