what is tandem lock and over speed on instrument cluster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jc · 09-13-2004, 07:29 PM

he all i just got my ebay tack today . when i took it apart to start kleening it up i noticed it had two warning lights buy the fuel gauge and a little light in the middle of the speedo gauge. the 2 by the fuel gauge say over speed and tandem lock. what the heck does tandem lock mean???i heard that speed warning clusters were hard to come buy .could i have stumbled upon a better deal than i thougt or is this thing from a dump truck. help please what is this . by the way i paid 165 shipped the needles have great color it needs a knew circut board and lens and it came with the harness.thanks for all input john

junkyardjohn · 09-13-2004, 07:46 PM

JOHN -- THAT CLUSTER IS OUT OF A BIG TRUCK - LIKE SAY A C-50.

JOHN

jc · 09-13-2004, 07:53 PM

thats what i was affraid of. but it looks like all i would have to do is replace the fuel gauge and you would never tell the differance. on normal speed warning dashes is thes a klight on the speedometer and an idiot light on the fuel gauge or just one or the other. also can the needles be removed from the fuel gauge without damage

ChevLoRay · 09-13-2004, 08:20 PM

On trucks with tandem axles, you have the option of locking both axles together, so that all eight tires turn in unison. I have had to do that, and when you need it, it's a great thing to have. We used to call them "Twin Screws", whether it was correct or not. When you have a load and you are trying to pull out of a pit, sometimes you needed to "lock them in". They didn't go around corners too good, though, when locked. In fact. when you got on hard pavement, you had better unlock 'em!! It's been 30 years since I drove a dump truck, so my senior moments are coming more often.

The engine overspeed warning light is for governed engines and warns you when the RPM's are close to the limit, or over it.

The dash would be from an ME-50, ME-60 series, or JM-80 series.

Rod · 09-13-2004, 08:36 PM

Swap the gas gauge with a light duty trucks gas gauge and your set to go if you have the correct light duty bezel also.

gonebad2 · 09-13-2004, 10:18 PM

I have a speed warning dash. There are two needles on the speedo. An orange one that tells the speed you are travelling and a white needle that you set with a small knob on the face of the instrument cluster. Rotate the white dial to the desired speed. If the orange needle passes it, a buzzer sounds off to alert the driver. No lights go off. I think speed warning was an option from 1967 to 1970. They are kind of hard to find.

09-13-2004, 07:29 PM	#1
jc Registered User Join Date: Jan 2001 Location: Jackson, New Jersey Posts: 1,560	what is tandem lock and over speed on instrument cluster he all i just got my ebay tack today . when i took it apart to start kleening it up i noticed it had two warning lights buy the fuel gauge and a little light in the middle of the speedo gauge. the 2 by the fuel gauge say over speed and tandem lock. what the heck does tandem lock mean???i heard that speed warning clusters were hard to come buy .could i have stumbled upon a better deal than i thougt or is this thing from a dump truck. help please what is this . by the way i paid 165 shipped the needles have great color it needs a knew circut board and lens and it came with the harness.thanks for all input john __________________ 2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER)

09-13-2004, 07:46 PM	#2
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	JOHN -- THAT CLUSTER IS OUT OF A BIG TRUCK - LIKE SAY A C-50. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

09-13-2004, 07:53 PM	#3
jc Registered User Join Date: Jan 2001 Location: Jackson, New Jersey Posts: 1,560	thats what i was affraid of. but it looks like all i would have to do is replace the fuel gauge and you would never tell the differance. on normal speed warning dashes is thes a klight on the speedometer and an idiot light on the fuel gauge or just one or the other. also can the needles be removed from the fuel gauge without damage __________________ 2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER)

09-13-2004, 08:20 PM	#4
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	On trucks with tandem axles, you have the option of locking both axles together, so that all eight tires turn in unison. I have had to do that, and when you need it, it's a great thing to have. We used to call them "Twin Screws", whether it was correct or not. When you have a load and you are trying to pull out of a pit, sometimes you needed to "lock them in". They didn't go around corners too good, though, when locked. In fact. when you got on hard pavement, you had better unlock 'em!! It's been 30 years since I drove a dump truck, so my senior moments are coming more often. The engine overspeed warning light is for governed engines and warns you when the RPM's are close to the limit, or over it. The dash would be from an ME-50, ME-60 series, or JM-80 series. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

09-13-2004, 08:36 PM	#5
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Swap the gas gauge with a light duty trucks gas gauge and your set to go if you have the correct light duty bezel also. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

09-13-2004, 10:18 PM	#6
gonebad2 Merciless Butcher Join Date: Oct 2003 Location: CC Nevada Posts: 1,447	I have a speed warning dash. There are two needles on the speedo. An orange one that tells the speed you are travelling and a white needle that you set with a small knob on the face of the instrument cluster. Rotate the white dial to the desired speed. If the orange needle passes it, a buzzer sounds off to alert the driver. No lights go off. I think speed warning was an option from 1967 to 1970. They are kind of hard to find. __________________ Your Bought And Sold....I Got Your Soul!

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