Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Mustang! Enter Daily

Ford Performance Multiport EFI Wiring Harness (86-93 5.0L)

AmericanMuscle no longer carries the Ford Performance Multiport EFI Wiring Harness (86-93 5.0L). Please check out Mustang Crate Engines and Blocks for an updated selection.

Features & Details

  • Genuine Ford Racing Harness
  • Complete Harness from PCM to Injectors
  • Fully Loomed for Easier Installation
  • Provisions for Electric Fan Control Output
  • Direct Fit on 1986-1993 302 H.O. Engines
Genuine Ford Part. Installing the iconic 5.0L V8 pushrod engine in your very own custom car or Foxbody Mustang just became a lot easier with a genuine Ford Racing Multiport EFI Wiring Harness.

Complete Harness. The Ford Racing Multiport EFI Wiring Harness consists of a single harness with integral connections for injectors and O2 sensors. It has provisions for electric fan control output and includes compact fuse, relay box, "Check Engine" light, and all necessary grommets.

Fully Loomed. Being fully loomed, from the PCM to all the sensors and injectors, typical installation takes less than 1 hour.

Application. The Ford Racing Multiport EFI Wiring Harness is a direct fit replacement for 1986-1993 302 H.O. engines and can be easily adapted to many other Ford V8 pushrod engines. Compatible with engines using both H.O. and non-H.O. firing orders Technical Note. Requires the use of a PCM from a 1989-1993 High Output 5.0L Mustang (not included).

Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 Details

MPN# M-12071-A50

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Wiring Harness
Installation Info
Tech Specs
Will it fit my Mustang?

    Customer Photos

      Questions & Answers (11)

      5 Top Rated Questions

      What all is excluded from this harness? Does it have the connectors for head lights and an OEM dash? Or is this strictly a racing harness with the bare min? I have done a 5.0 swap into a 91 LX, And am having a hard time finding a ECU harness and this looks like a good fit. But I want the car to still be streetable. Thanks, Vess

      • It is a racing harness, It has everything you need to EFI a car. It is very high quality and similar to 89-93 mustang wiring harness as far as the layout. but does not have any accessories loomed in. It is meant for taking a 302 engine and installing it any kind of Hot rod. No head lights, No air bags, No charcoal canister relay, No smog, only the EGR. No low oil sender wiring. And it is a very clean fit. I had a few advantages in my swap, I had my old harness so I had a few connectors I reused. I did not need the airbag wiring because I am changing my steering wheel, I did not need the low oil harness because I have a 7 quart pan and no provisions for the oil sensor, and I just vent the charcoal can out. And the harness includes wires for temp, oil pressure, tach, check engine light. It comes with a fuse/relay box. and this is a great unit, it has the fuel pump relay, A/C cutout relay, and EEC relay. which eliminates a lot of relays being mounted all over the car. It also comes with a great instructional manual, but some of it is left out if you are installing it in a fox. Good luck, NA Notch

      Helpful (1)

      Can this harness work with the 94-95 HO 5.0L

      • This harness is confirmed only to work with the 86-93 5.0L models.

      Helpful (0)

      Can you just buy the fuse block for the harness having problems with mine thanks.

      • I apologize, we do not offer the fuse box separate from the kit. 

      Helpful (0)

      can this be used without the tfi module?

      • The Ford Performance Multiport EFI Wiring Harness is designed to be used with a TFI ignition module. Use with another form of ignition module would require modification of the harness.

      Helpful (0)

      does this harness have the plug for the low oil level senser

      • The Ford Performance Multiport EFI Wiring Harness will not have the low oil sensor connector as part of the harness.

      Helpful (0)
      Post Your Question
      6 More Questions
      do you make the efi wiring harness for 1985-1989 ford f 150 trk with 5.0 motor , air conditioning , mass air flow , non high output motor , oil sensor , dual tanks , 1 answer
      Hello! I have a 5.0 ho from a 91 t-bird with a remote tfi, and pcm. With this harness do I need to change the disturbitor and pcm from a mustang? Thanks for your time and effort 1 answer
      Does it come with instructions on what sensor is for what plug , I don't want the egr I just want what is nesesary for the car to work would I be able to take out the egr cable out? Looking for the simplest way to install not worried about emissions 1 answer
      does this plug into a4r70w trans or will i need a stand alone controller? and also do i need a mass air computer for this? 1 answer
      Is this Everything i need to go from Carb EFI? i have an 83 carb and im putting an 89 302 engine in it and it has no wiring harness is this all the wiring i need ? or is anything excluded? please reply 1 answer
      will there be any other harness required for the rest of the vehicle or is this all that is required to retro fit a 5.0 into this vehicle? 1 answer

        Customer Reviews (5) Write a Review

        Overall Rating 3.8

        out of 5 stars

        • 1/5

          November 22, 2018

          Efi multiport 87-93 harness

          No longer available, too bad for those of who like the old systems. Had to buy elsewhere.


          Year: 1993 Submodel: LX

          Helpful (5)

        • 5/5

          February 25, 2018

          Easy and great

          On build didn’t want to put 30 year old wiring in new build. This harness was basically plug and play. Cleans up engine bay just need your harness for the dash and lights


          Year: 1986 Submodel: Other

          Helpful (8)

        • 4/5

          February 28, 2017

          nice product

          bought for my 75 bronco that was getting a mustang injection system in it. very simple harness. just plug everything in and hook up a few wires and ready to go.


          Year: 1993 Submodel: LX

          Helpful (10)

        • 4/5

          February 17, 2017

          Very Nice Harness

          The harness is everything it says it is and eliminates the salt and pepper connectors, the only reason I didn't give it 5 stars is there is no customization options such as no a/c or relocation of the mapp sensor to the fender well. I'd buy another if I needed it though.


          Year: 1989 Submodel: GT

          Helpful (14)

        • 5/5

          October 19, 2013

          great overall product

          amazing difference in running quality.after dealing with the old 25 year old wiring i gave up and oped for the ford racing harness. if you have basic wiring skills its a no brainer to install


          Year: 1989 Submodel: GT Lake in the Hills, IL, USA

          Helpful (9)

        Related Mustang Categories