1987-1993 Fox Body Mustang: 5.0 Resto Instrument Cluster Printed Circuit Boards - Review & Install

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.
Product Links
87-89 Primary Circuit Board: lmr.parts/LRS-10843B
87-89 Secondary Circuit Board (GT Models): lmr.parts/LRS-10843C
90-93 Primary Circuit Board: lmr.parts/LRS-10843D
Shop Instrument Cluster Parts: lmr.com/products/79-93-Mustan...
Watch
Instrument Cluster Removal: • How To Remove Fox Body...
Tool List
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
Torque Specs
Cluster Lens to Housing Screws - Finger Tight (or until the screw contacts the lens)
Instrument Module Bezel to Housing Screws - Finger Tight (or until the screw contacts the bezel)
Chapters
00:00 - Video intro & part explanation.
01:27 - Printed circuit board fitment information.
02:29 - Other parts to consider.
03:13 - Explaining the alternator charging resistor.
03:48 - Other videos to consider & installation notes.
04:59 - Removing the cluster lens.
05:18 - Remove the secondary circuit board (87-89 GT only).
05:45 - Remove the bezel & separator plate.
06:12 - Remove rearward attaching hardware & anti-slosh module.
06:34 - Disassemble the instrumentation modules.
07:05 - Depressing the metal clips, loosening the bulb sockets, & removing the existing circuit board.
07:37 - Clean the cluster housing & put on some nitrile gloves.
07:47 - Install the new circuit board.
07:58 - Clean the existing bulb socket terminals & reinstall the sockets into the cluster.
08:17 - Clean & transfer the metal clips.
08:33 - Reinstall the instrumentation modules.
08:55 - Carefully clean the cluster components.
09:09 - Reposition the separator plate & bezel.
09:22 - Reinstall the rearward attaching hardware & anti-slosh module.
09:31 - Install the new secondary circuit board (87-89 GT only).
09:41 - Reposition the needles & reinstall the cluster lens.
09:55 - Changing the alternator charging socket (reference notes in the video).
10:11 - Final thoughts & outro.
#lmr #foxbodymustang #restoration
Use of this video is subject to the terms as set forth in our LMR Install Video Disclaimer | lmr.com/page/lmr-install-vide...

[@johnkropp3793]

We really need 79-86 products ❤

[@dntlss]

You guys are the best bar none,I'm in my 50s now and still drive a 5.0 everyday (when i was younger and these cars came out we never called them Foxbodies, no one did) plus i have my backup that I'm restoring,i remember being in my late 20s when LMR came out,i have been buying stuff from you guys since then, i was tallying up how much money i have spent with you guys in the last 6 years, it was something like 5 grand!! thats just the last 5 years, not counting the other 19 or so, lol, i sure love these cars and always will, I'm a true fanatic. These circuit boards will be a godsend,there is actually one of these traces on this board that goes to your alternator,what happens is after many years of removing the cluster to install gauges or any other thing you remove the lower power plug and sometimes it "bites" the circuit board once you plug it back in because the board is pliable and it has to be folded into the hole in the cluster where the plug goes in and eventually it will cut that trace, what happens next is your alternator wont charge the battery and you are pulling your hair trying to figure out why???? Last place in the world you would be looking for a issue with your charging system is in the back of a cluster,lol, its part of the voltmeter gauge circuit, you guys ever need any help with strange issues regarding these cars just drop me a line,chances are i have experienced it 🤣

[@latemodelrestoration]

Thank you for your loyalty over all these years! We sincerely appreciate your business and I hope your experiences have been great! -Landan

[@JesseAndMike]

That is nice! Awesome video!

[@ogsuperflygarage]

Another amazing part to the puzzle to fully restoring our Fox Mustangs! Thank you guys!! Another great demo Landon!

[@latemodelrestoration]

Thanks! -Landan

[@bryceholmes5178]

I recently did this with my 91. Purchased my circuit board from a competitor, and I couldn't believe it, it was an old new stock part! I was so nervous, but it was easy.

[@marks93cobra]

I concur with Landon, swapping in a new cluster lens does make a huge difference.

[@cpearson7372]

Thank YOU!! I don't have to, at this time, change the cluster board, but this is a gift that is FANTASTIC. I have a problem with my fuel gage needle, have had it since I bought my '87 used in 1992. It reads FULL, until I have maybe a gallon or less? and then drops to empty!! I have used my trip odometer, and every 280 to 300 miles, I fill up.

[@latemodelrestoration]

Glad that this will be able to help you out! Thanks again for shopping with us!

[@snowsolo]

Try replacing the fuel level sending unit in the gas tank. Roughly a $60 part.

[@mrbighands]

Foxbody FTW!

[@MrLiquidSniper]

Glad to see this kind of stuff, but you guys seriously need to step it up on the 79-86 cars baaaaad. You leaving us four eye guys behind.

[@CLEEN50]

and on all 93 cobra specific pieces. Time to one up Cervinis!

[@T-bird_Johnny]

Ha! Try being a 91-93 5.0 Thunderbird guy, our cars are a weird combo of, 94-95 'stang, foxbody, taurus, '99+cobra, and unique Thunderbird parts. Idk how I even keep mine on the road sometimes 😅. Lol parts hunting is half the battle

[@latemodelrestoration]

We have somethings in motion. The stuff just takes time. Thanks for understanding. -Landan

[@IgottaV8]

That’s awesome!!!!

[@GreenToFeelBlue]

Heck yeah!!

[@mikekeller7342]

Nice guys!! You know what the next ask is now don't you?!?!? Anti-slosh module!!! 😁

[@robbobsjobs8456]

Dope!!

[@gregorytibbs8790]

Also need 1994 thru 1995. But this is an excellent product.

[@jamesross4702]

Would a bad cercit board be the reason for my oil, temp and gas gauges not working properly or at all?

[@latemodelrestoration]

Possibly. I'd recommend disassembling the gauge like you see us do in the video and inspect the factory board for broken or damage circuits. -Landan

[@jamesross4702]

@@latemodelrestoration thanks, I have plans on doing that here soon just thought I'd verify

[@supra6t9]

A quality underhood insulation pad with pony on it would be sweet

[@latemodelrestoration]

Thanks for the comment. I'll forward this to our product team. -Landan

[@chavislee5137]

Can we get a nitrous kit install on a foxbody mustang

[@latemodelrestoration]

Thanks for the comment! We don't have any plans to add a nitrous kit to a Fox Mustang at this time. -Landan

[@chrislangley4724]

No 79-86

[@Fade_Modded]

As always

[@chrislangley4724]

@@Fade_Modded I bet there's a lot of 4eyes that don't get restored because of those hard to find pieces

[@marks93cobra]

@@chrislangley4724 I feel for you guys...I love the 4-eyes.

[@dntlss]

@@marks93cobraThey are sweet, i would love to have one.