I like to figure about 5-7 feet for each wire you're going to run (some will be longer, some will be shorter). For the ECU plug alone that's about 30 wires give or take. Multiply that by 7 feet to be on the safe side and you're looking at 210 feet of wire for an entire engine harness at the maximum.
1,000 feet is WAY overkill. If this web site didn't have 250 feet minimum order on this type of wire I would have gotten much less. For a whole harness you could do something like 70 feet of four main colors and maybe 35 feet of an assortment of four other colors and be well set.
Maybe some length of some thicker gauge wire too for some stuff like grouped grounds and slightly higher power draw stuff.
The headlight harnesses are going to be even less wire. But you'll want thicker gauge.
1,000 feet is WAY overkill. If this web site didn't have 250 feet minimum order on this type of wire I would have gotten much less. For a whole harness you could do something like 70 feet of four main colors and maybe 35 feet of an assortment of four other colors and be well set.
Maybe some length of some thicker gauge wire too for some stuff like grouped grounds and slightly higher power draw stuff.
The headlight harnesses are going to be even less wire. But you'll want thicker gauge.