Guage Clusters.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Canadian694x4** · 12-23-2003, 11:12 PM

I borrowed this picture from another post 2 help illustrate my question. I have a dummy cluster (Speedo and Gas Gauge Only) and on the back it seems to missing the same plug as this one.

What are the black plugs for or do? And why is that one missing?

**Canadian694x4** · 12-23-2003, 11:12 PM

front of cluster i have...

**Canadian694x4** · 12-23-2003, 11:13 PM

back of cluster...

Andy4639 · 12-23-2003, 11:17 PM

It's one of your instrument light bulbs like the others that light up the speedomoter.

1970blazin · 12-23-2003, 11:18 PM

If you pull out those black plugs (they twist out) there are light bulbs on the other sides. The one that is missing is the black plug that is at the end of the fiber optic indicator light that is supposed to go from there...up your steering column and into the shift indicator for an automatic truck. It carries light from the gauge cluster to the shift indicator. If you do a search on "fiber optics" I bet you will find some good threads about this topic.
I know this because the previous owner of my blazer cut my fiber optic cable and a board member sent me one for free in the mail so that mine would light up. It was kind of a pain to replace, but it always seems like those little things end up a pain in the a$$

beautimus · 12-23-2003, 11:21 PM

thats a hole for another indicator light, aroung the speedo their are several warning lights, around here if you buy a truck with a lamp unplugged, it's probably because the previous owner was unable to make it go off. most likely a brake, or check engine light.
shine a flash light through the hole and see what lights up on the front.

1970blazin · 12-23-2003, 11:29 PM

Here is a pic of one lit up and the off white lightbulb holder is the one you are missing in the back of your gauge cluster

12-23-2003, 11:12 PM	#1
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,308	Guage Clusters.... I borrowed this picture from another post 2 help illustrate my question. I have a dummy cluster (Speedo and Gas Gauge Only) and on the back it seems to missing the same plug as this one. What are the black plugs for or do? And why is that one missing? Attached Images __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 22 Yrs - 1 of 208 Built & Sold In Canada!- 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 3 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 17 Yrs- 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 15 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 8 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

12-23-2003, 11:12 PM	#2
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,308	front of cluster i have... Attached Images __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 22 Yrs - 1 of 208 Built & Sold In Canada!- 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 3 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 17 Yrs- 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 15 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 8 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

12-23-2003, 11:13 PM	#3
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,308	back of cluster... Attached Images __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 22 Yrs - 1 of 208 Built & Sold In Canada!- 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 3 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 17 Yrs- 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 15 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 8 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

12-23-2003, 11:17 PM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Light Plug It's one of your instrument light bulbs like the others that light up the speedomoter. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

12-23-2003, 11:18 PM	#5
1970blazin Blazerless:-( Join Date: Jun 2003 Location: Olympia WA Posts: 1,612	If you pull out those black plugs (they twist out) there are light bulbs on the other sides. The one that is missing is the black plug that is at the end of the fiber optic indicator light that is supposed to go from there...up your steering column and into the shift indicator for an automatic truck. It carries light from the gauge cluster to the shift indicator. If you do a search on "fiber optics" I bet you will find some good threads about this topic. I know this because the previous owner of my blazer cut my fiber optic cable and a board member sent me one for free in the mail so that mine would light up. It was kind of a pain to replace, but it always seems like those little things end up a pain in the a$$ __________________ 1970blazin 1970 CST Blazer-Orig. Dark Blue-SOLD Progress Pics of Blazer for sale

12-23-2003, 11:21 PM	#6
beautimus Registered User Join Date: Mar 2002 Location: woodstock, alabama, usa Posts: 938	thats a hole for another indicator light, aroung the speedo their are several warning lights, around here if you buy a truck with a lamp unplugged, it's probably because the previous owner was unable to make it go off. most likely a brake, or check engine light. shine a flash light through the hole and see what lights up on the front. __________________ i survived cancer and kidney stones, but my kids are killing me.

12-23-2003, 11:29 PM	#7
1970blazin Blazerless:-( Join Date: Jun 2003 Location: Olympia WA Posts: 1,612	Here is a pic of one lit up and the off white lightbulb holder is the one you are missing in the back of your gauge cluster Attached Images __________________ 1970blazin 1970 CST Blazer-Orig. Dark Blue-SOLD Progress Pics of Blazer for sale



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