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  1. #1

    Default 1990 5.0 Main engine bay harness into 1979 dash/interior

    Will this be plug and play or do I need to get a 86 efi harness? my doner car is a 90 and the body is 79 (former 4 cyl).
    Also could I get a 85-86 HVAC W/AC and work on 79?

    Thx J
    Last edited by 5ptslow; 04-29-2022 at 06:43 PM.
    79 Notchback 2.3 cyl to 347 & t-5 swap 65K
    90 Hatch 5.0 T5 Donor for 79
    67 Fastback full resto 289 + c4
    86 GT 5.0 5-Speed T-Top - Gone
    92 5.0 Auto Hatchback - Gone
    89 5.0 5-speed Notch - Gone

  2. #2
    Moderator wraithracing's Avatar
    Join Date
    Jun 2010
    Grand Junction, CO/RR TX


    Nothing will be plug and play with the difference in year models.

    Yes, you can get an 85/86 HVAC to work in a 79. You will have to cut the firewall opening for the different A/C line style of the 82-93 compared to the 79 model. I did the same thing with my 79 Pace Car. Good Luck!

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
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  3. #3
    FEP Power Member David Claflin's Avatar
    Join Date
    Oct 2008
    Redneck Riviera, Fort Walton Beach Florida


    Get one of these, and one from your donor car. Main ones to be concerned with are near the brake booster, I kept the harness from the under dash area of my LTD, and just got power to those few wires from the EFI harness that needed it. Most of the wires color coding is pretty standard, not all are, but most.
    1985 LTD LX, Mach1 brakes, 17" Mopar police car wheels. 331, T5, 4.10s
    1984 LTD station wagon, with 84GT nose, some might remember it as the old Dugan Racing station wagon.
    1986 FHP coupe, stock shortblock, TW heads, Holley SMII intake, 4.56, T5
    1990 Red LX, ported AFR heads, TFS-R box upper, weenie cam, 1 3/4 long accufabs, 3" exhaust, T5, 4.88

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