I like this particular re-location kit because it's a complete plug-n-play with little to no splicing:
http://mccullyracingmotors.com/index_files/Page2271.htmI've been reading a few 5.0L forums on the PIP and it's apparently a shielded wire. I haven't crawled back under the hood yet because I can't get the truck in the garage and it's been terrible weather lately, but when I do it appears I'll need a shielded wire to replace the PIP wire to the firewall and the shielding must be grounded. I've purchased a replacement plug, I think I'll be buying the McCully Racing kit, and apparently I'll need some shielded wire to replace the PIP from the new plug to the firewall.
Soon as the weather lets up I'll be giving this a go.
1986 F250HD 4x4
5.0L EFI, NP435