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5.0 Resto Instrument Cluster Printed Circuit Boards Installation

Created by Tyler Rodriquez / 7 min read
Date Created: 9/28/2023
Last Updated: 2/9/2024

Restore the functionality to the instrument cluster in your 1987-1989 Fox Body 5.0 Mustang with this quality replacement primary cluster circuit board from 5.0 Resto!

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Viewing this install and using the information shared is subject to the terms set forth here - View the LMR Install Instructions Disclaimer.
The instrument cluster printed circuit boards are one of the areas that are often never considered or thought of because of what they are and where they're located on 1987-1993 Fox Body Mustangs. Well, if you have issues related to the cluster, the printed circuit board could potentially be the issue. Below is a rundown of the printed circuit boards.
 
The printed circuit boards move information through the vehicle relative to the circuitry that is within the instrument cluster. Problems you'll see from a damaged circuit board are: inaccurate or no reading from the gauges, cluster lighting issues, or alternator charging problems if the resistor is damaged or missing.
 
You'll see these sold as three options: a 1987-1989 primary board, 1987-1989 secondary board (GT only), and a 1990-1993 primary board. Each circuit board is specific to the cars originally equipped with a 5.0L engine.

Purchase Fox Body Gauge Cluster Circuit Boards

TOOLS NEEDED:

  • Soft Brush
  • Microfiber Towels
  • Mild Cleaner (This must be safe enough to use on the instrumentation modules)
  • Nitrile Gloves
  • T-15 Torx Driver
  • Needle Nose Pliers

1. Remove screws securing lens to cluster.




2. Separate lens from cluster.



3. Locate and remove sockets from secondary board.



4. Lift board and pass through cluster housing notch. Set aside upper board section.



5. Position cluster with gauges facing you; take pictures for reference.



6. Loosen and remove bezel screws; remove bezel and separator plate.




7. Remove nuts and dislodge fuel anti-slosh module from back of cluster.




8. Remove four instrument sections starting with right-hand side.




9. Depress metal clips and push them through cluster housing.




10. Rotate bulb sockets to remove them.




11. Remove old circuit board.




12. Clean cluster; wear gloves before handling new board.



13. Position new circuit board, press over locating pegs.



14. Check and clean terminals before reinstalling sockets.



15. Reinstall sockets and transfer metal clips.



16. Reinstall instrument sections.



17. Clean separator plate; consider painting if needed.



18. Clean and reinstall bezel; snug down retaining screws.



19. Reinstall nuts; finger tight.




20. Reinstall anti-slosh module and retaining screw.




21. For 87-89 GT, install secondary board and sockets.




22. Reposition needles using reference picture.




23. Install cluster lens; snug down retaining screws (avoid overtightening).



24. Note bulb socket with resistor; consider replacement for simplicity.



25. Reinstall instrument cluster and related components.




About the Video

1987-1989 Fox Body Mustang: 5.0 Resto Instrument Cluster Printed Circuit Boards - Review & Install

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Published on 2023-09-21
The instrument cluster printed circuit boards are one of the areas that are often never considered or thought of because of what they are and where they're located on 1987-1993 Fox Body Mustangs. Well, if you have issues related to the cluster, the printed circuit board could potentially be the issue. Below is a rundown of the printed circuit boards.

The printed circuit boards move information through the vehicle relative to the circuitry that is within the instrument cluster. Problems you'll see from a damaged circuit board are: inaccurate or no reading from the gauges, cluster lighting issues, or alternator charging problems if the resistor is damaged or missing.

You'll see these sold as three options: a 1987-1989 primary board, 1987-1989 secondary board (GT only), and a 1990-1993 primary board. Each circuit board is specific to the cars originally equipped with a 5.0L engine.
Thumbnail image of the author of this article, Tyler Rodriquez.

About the Author

Tyler has written content for Late Model Restoration for nearly 8 years, producing over 300 articles. As an avid New Edge fan, Tyler has owned 4 2004 Mustangs and an 88 Convertible Fox Body. Read more...