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Guest Message by DevFuse

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Fuel Gauge Backlight

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4 replies to this topic

#1 Brock


    New Boss 302 Member

  • Pacific Coast Region
  • 6 posts
  • Region:U.S., Pacific Coast
  • Current Vehicle:Laguna Seca
  • Boss 302's Year:2012

Posted 13 April 2017 - 11:02 AM

The backlight for the fuel gauge in my 2012 Laguna Seca is acting up. 


When the headlights are on the gauges reduce their brightness and the fuel gauge is dimmer than the rest and sometimes does not illuminate at all. The needle always illuminates correctly but the gauge graphic will flicker, be dimmer than the rest of the gauges or go dark. When the gauges are in daylight mode, headlights off, the fuel gauge looks just as bright as the other gauges. 


Haven't found too much on this issue online which leads me to believe it is an isolated event. How easy is it to get the gauge pack out?


Thoughts on this would be helpful.



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#2 TymeSlayer



  • Mountain Region
  • 3,106 posts
  • Region:U.S., Mountain
  • Current Vehicle:2017 Ford F-150 Lariat 4x4 SuperCrew FX4 - 2013 Ford Edge Limited - 2012 Kona Blue Boss 302
  • Boss 302's Year:2012
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Posted 14 April 2017 - 07:05 AM

It shouldn't be too hard as both myself and 302HP removed them to add our LS dash gauges. 302HP did a nice write up on the install so look up his post. 

Edited by TymeSlayer, 17 April 2017 - 09:11 AM.

  • 302 Hi Pro likes this

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#3 302 Hi Pro

302 Hi Pro

    Boss 302 Builder

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  • Region:U.S., Northeast
  • Current Vehicle:2012 KB Boss 302 Mustang
  • Boss 302's Year:2012

Posted 17 April 2017 - 06:19 AM

UIt shouldn't be too hard as both myself and 302HP removed them to add our LS dash gauges. 302HP did a nice write up on the install so look up his post.


Thank you for the kind words.

Here is the link to the LS Gauge install which includes the IP R&R:


Please let us know what you find on your fuel gauge light problem.

PS: Yes Imwould agree, it is not a common problem, I would start with checking grounds.

Good luck,
302 Hi Pro

2012 KB Boss 302 MC: 500A | Boss Production Line Assembly Number 2800. Vehicle Special Ordered with Recaro Sport Seats & 3.73:1 Torsen Option | Engine: FRPP 84.5MM TB, Peterson CJ Vent Can, TracKey Activated, AirAid CF PJ CAI, FRPP 84.5MM TB | Drivetrain: AE 4.0" Aluminum DS, MGW Gen 3 Race Spec Shifter, GT500 Clutch Pedal Box, FRPP Stainless Clutch Line, Dedicated Clutch Fluid Reservoir, FRPP Trans Cooler Scoop. | Exhaust: Silver Ceramic Kooks Super Street Headers, MagnaFlow Street/Comp 3.0" SS CB X-Pipe System, Open Kooks SS Boss Side Pipes. | Suspension: FRPP "T" Springs (alternate Steeda Boss Rear Springs), Koni Sports (Yellow) Adjustable Struts/Shocks, Steeda HD Camber Plates, Cortex Watts Link, Steeda Billet KB Poly/Spherical LCA's, KB LCA Relo Brkts, Steeda Adj. UCA & Energy Suspension Sys. Upper Diff Housing Bush, OEM Boss Rear Sway Bar | FRPP GT500 Forged wheels, (19X9.0 F & 19X10.0" R) | Brakes: FRPP Boss 302 Cooling Duct Kit, Steeda SS/Kevlar Brake Lines, GT500 13.8" Rear Rotors, GT500 Rear Brake Pads, Dot 4 Motul 600 HT Fluid | Body: FRPP Boss 302S Grill, FRPP Boss 302 LS Front Splitter, FRPP GT500 Rear Spoiler & Serviceable Gurney Strip, BFR Front Tow Hook, Jacking Plates, 3M Window Tint, (35/20), OEM Boss 302 Floor Mats & Boss 302 Car Cover, Pioneer TS-D6802R Speaker System, Auto Dim, Home Link & Compass Mirror. Notes: Current Intake System - Ram Air thru Front Grill Fog Light, OEM CAI Box and AEM Aluminum Intake Tube with Drop-In High Flow Filter. In Testing Spring 2016. SCT-X4 Tuner used exclusively for Data-Logging AFR/Timing Curves Only. FRPP TracKey is Preferred PCM Tune.

#4 Brock


    New Boss 302 Member

  • Pacific Coast Region
  • 6 posts
  • Region:U.S., Pacific Coast
  • Current Vehicle:Laguna Seca
  • Boss 302's Year:2012

Posted 18 April 2017 - 05:34 PM

Thanks for the info. I'll look into it further. 

#5 Rich B.

Rich B.

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Posted 20 April 2017 - 03:58 AM

Dash lighting is supposed to dim when headlights are activated to preset intensity level. Never having my instrumentation apart, I found in the past they're all mounted on a circuit board, stripped with the bezel(s) making them appear as all individual gauges.

The problem appears as though it may be a major headache. Sounds as maybe a hairline soldier crack or circuit board ribbon fracture or defect. Actually an easy fix but you have to disassemble the entire dash to get the board out retouch the flaw with a low wattage solder iron and reinstall.

Where did all the old fashioned junk yards go too? There might be 1/2 dozen exact replacements in junked cars sitting there. Would go in on a Sat. morning w/socket set and rummage through it all. On the way out would stop at office with salvaged parts. They were negotiable on prices and half the time would just give them to me and were clueless as what the parts were for even, especially the sensors.

Edited by Rich B., 20 April 2017 - 03:49 PM.

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