5.2 5.9 magnum EFI plug and play harnesses

I love my '94 Dodge ram 1500 but after 242K miles the motor (3.9ltr) is tired, piston slap. I dropped in a rewman. 5.2 i need a wiring harness and had no luck. it had front ABS, AC, manual tans. Only part can't find is the harness. Please help me! I've driven this truck all but ~100 milles myself. Please let me know if you can help!
LeeC