Speedometers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skysoldier173rd · 10-13-2010, 08:51 PM

I see several brands of aftermarket speedometers are available. Just wondering how these things work, and if they can be calibrated or adjusted based on a particular transmission or gear ratio. Also are there cable types that can be adjusted to match our mismatched gears, engines and transmission combinations?

Big Fenders · 10-13-2010, 10:04 PM

I'm putting together a 1960 suburban and the dash console and gauges are to be replaced.In answer to your question it seems that you can buy a mechanical speedo and probably with swapping out 'driven gears' you can just about dial it in or figure out which tooth count gear you need to match your rear end . But after all of that you can buy an electrical gauge that seems to be able to be easily set up electrically to give correct readings. Electrical speedo is about twice the cost of a mechanical one.
Bob

**Captainfab** · 10-14-2010, 12:28 AM

An aftermarket mechanical speedo isn't going to be able to be adjustable. You would still need to change the gears in your trans to get the speedo to be accurate.. Some of the electronic speedos are adjustable as Big Fenders said.

**Clyde65** · 10-14-2010, 10:42 AM

Get a GPS speedo and electric guages. This way you dont have to even care what rear gears or trans speedo gear ya got, just drive the crap out of it.

10-13-2010, 08:51 PM	#1
skysoldier173rd Registered User Join Date: May 2010 Location: jackson, michigan Posts: 246	Speedometers I see several brands of aftermarket speedometers are available. Just wondering how these things work, and if they can be calibrated or adjusted based on a particular transmission or gear ratio. Also are there cable types that can be adjusted to match our mismatched gears, engines and transmission combinations?

10-13-2010, 10:04 PM	#2
Big Fenders Registered User Join Date: Mar 2008 Location: Tucson Arizona Posts: 264	Re: Speedometers I'm putting together a 1960 suburban and the dash console and gauges are to be replaced.In answer to your question it seems that you can buy a mechanical speedo and probably with swapping out 'driven gears' you can just about dial it in or figure out which tooth count gear you need to match your rear end . But after all of that you can buy an electrical gauge that seems to be able to be easily set up electrically to give correct readings. Electrical speedo is about twice the cost of a mechanical one. Bob

10-14-2010, 12:28 AM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Speedometers An aftermarket mechanical speedo isn't going to be able to be adjustable. You would still need to change the gears in your trans to get the speedo to be accurate.. Some of the electronic speedos are adjustable as Big Fenders said. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

10-14-2010, 10:42 AM	#4
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Speedometers Get a GPS speedo and electric guages. This way you dont have to even care what rear gears or trans speedo gear ya got, just drive the crap out of it. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*



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