Need help wiring A/F gauge

Get an inline fuse holder and splice into one of the switched circuits on the ignition switch. Your instrument won't draw more and 2-3 amps, and probably less than that. As long as you use a high current (20-30 amp) circuit you can splice into it and add a 10 amp inline fuse. Be sure to solder the splice and use heat shrink tubing to cover the spliced area. See http://oldfuelinjection.com/?p=7 for some soldering help and tips.

Diagram courtesy of Tmoss & Stang&2birds





Better still, use the spare position on the fuse panel by adding another slip on connector to the spare slot. Use a voltmeter to determine which spare is live only when the ignition switch is in the Run position. One side of the spare position should already have the connector, and you crimp a slip on connector to the 16 gauge wire and feed it into the front side of the open spare fuse slot. Make sure the wire is long enough to reach the instrument without splicing on more wire. With the new wire in place, add your 10 amp fuse and you are good to go.


See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

HVAC vacuum diagram
http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pin out
http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif

Fuse box layout
http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

87-92 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang87-92 PowerWindowWiring.gif

93 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang93PowerWindows.gif