5.0L Classic Harness
Turn your classic Mustang or early Bronco into a fuel injected Stallion. Swap a 5.0L/5.8L engine into your horse using the popular & unbeatable 1989-93 Mustang 5.0L technology. Plugs into the original Ford body harness or easily adaptable to any aftermarket chassis harness with only 3 wires. Its superior design only draws 0.7amps from body harness, which minimizes the stress on 30+ year old electrical systems. Harness is designed to mount the ECM under the dash. Harness has our famous EGR eliminator pre installed! Can be used with long tube headers or stock exhaust manifolds. It’s pre-wired for Air Conditioning or On-Board-Air compressor. Harness can be used with 5 speed manual or AOD transmission. Plug-in-play with the Baumannator TCS electronic Transmission Control System. Built in the U.S.A. with brand new OEM Ford connectors, 260 degree GXL wire, 300 degree corrugated wire loom, and 1200 degree fiberglass loom around the exhaust. These are built right, quality checked, and electronically tested for the highest quality harness on the market today. 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. Includes firewall grommet and complete instructions.
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.
Ford Racing Performance Parts EFI harness
M-12071-A50 = $685 Retail
1 piece design
Harness does comes wrapped, no 1200°F fiberglass protection.
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, no 1200°F fiberglass protection.
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
Painless Wiring Ford EFI harness
60510 = $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.
Street & Performance, Inc
$700 to $1000
Harness is not “New” they re-use old connectors and wire from a harness you send them.
They started a false rumor that “Ford has discontinued the connectors.”
Harness comes wrapped, no 1200°F fiberglass protection.
They can make a custom fit harness.
Windsor Fox EFI harness
$625 to $1000
Harness is not “New” they re-work the above (discontinued) Ford Racing EFI harness.
Harness comes wrapped, no 1200°F fiberglass protection.
Air Conditioning and Alternator options available.
They can make a custom fit harness.
Check list to make sure you have all the right parts
Download the INSTALLATION MANUAL 
(465 KB)
Download the Alternator upgrade MANUAL (93 KB)
Also avalible at:
American Mustang Parts
BC Broncos
Mustangs Unlimited
Toms Bronco Parts
West Coast Broncos
Quality Auto Specialties
Labor charge for custom work: $60/hour
