I think the only reason they stopped with that year is the fact that they didn't have a 78 or 79 to do a test install in... at least thats what they told me when I called em.

I figure the mods required (if any) wont be too extensive, and I'd like my wiring to at least somewhat resemble the stock wiring diagrams (makes things a bit easier down the road... dont have to keep track of a collection of notes that I haven't looked at since I wrote em)

I'd consider building one myself based off the harness that's currently in there, except for the fact that it was a farm truck... Current wiring harness has about 4 extra plugs, and theres a couple that have been "re-purposed"... no idea why, but most of the electronics work, although you do sometimes have to smack the dash.