5.0L Universal Harness
Designed for Cobra Kit cars and other hot rods seeking fuel injection supremacy. Swap a 5.0L/5.8L engine into your vehicle using the popular & unbeatable 1989-93 Mustang 5.0L technology. Lay in it, connect 3 wires and it runs! Its superior design only draws 0.7amps from ignition switch, which minimizes the stress on older vehicles. Built in the U.S.A. with Brand New OEM Ford connectors and 260°F GXL wire for the highest quality harness on the market today. Harness has our famous EGR eliminator pre installed! Designed to fit long tube headers or stock manifolds. Harness will give you the cleanest most reliable fuel injection installation! Works with any performance upgrade or engine diagnostic tool designed for the Mustang 5.0L.
Comes with an assortment of wire loom, harness wrap, and zip ties to give it a finished look!
Custom applications can be built by request; computer changes, intake flip, alternator, A/C compressor, add emissions compliance, any demand can be met.
But why purchase this EFI harness, how does it compare to the other harnesses on the market?
Here are all the Ford EFI harnesses that are on the market already, feel free to compare.
Painless Wiring Ford EFI harness
$550 Retail
1 piece design
Missing important circuits and will not allow an engine running Self-Test (KOER).
Sensitive TFI wiring is not shielded which increases chance of ignition failure.
Does not come with any covering, bare harness with zip ties.
8 fused circuits are very bulky. 1 fuse just for 4 injectors is pointless overkill.
Only 2 relays, does not provide clean power source for the entire harness.
No Air Conditioning or Alternator options available.
Ford Racing Performance Parts EFI harness
$685 Retail
1 piece design
Harness does comes wrapped.
Must reprogram ECU for Electric Fan.
Relays are non-serviceable!
Does not include Alternator, or guage sender wiring.
No Speed Sensor, can cause stalling.
Ford Racing Performance Parts EFI harness
$535 for all 3 harnesses (M-12071-C302 / M-12071-E302 / M-12071-J302)
Obsolete as of 2003
3 piece harness design is for assembly line production
Harness Disconnect system was recalled on 3/27/1992 (RECALL 91E19)
15 wires to connect, and other wires will need to be moved.
Harness does comes wrapped.
Does not include Alternator, Inertia switch, or A/C compressor connectors.
Harness fits a 93 Mustang, other applications require re-working the harness.
Made in Mexico
Check list to make sure you have all the right parts
Download the INSTALLATION MANUAL 
(334 KB)
Download the Alternator upgrade MANUAL (93 KB)
Also avalible at:
Factory Five Racing
BPT MotorSport of Australia
Labor charge for custom work: $60/hour
