Do different styles of speedometers have different calibration?
 

I've got an '89 IROC 140 mph speedo that I was thinking about putting in my '83. I think that part should be pretty straight forward. The question is will it read the same as my '83 model speedo reads? I'm not sure, can anybody help?

thanks
Clem

I would expect so... I put a later model one in my 83 Z28, seems to read about right...

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"So many Mustangs, so little time..."
ICON Motorsports

If you get it to plug in it'll work just fine. Your concern should be that the 89 is electronic (In birds anyways, can anybody confirm this in Camaros?) and yours is cable driven, and while its possible to swap it could be a hassle.

Hope that helped,
-Max

Mechanical speedos are calibrated so that when the cable is turning at 1000 rpm, the speedo will read 60 mph.

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1984 Z28 (L69) monochrome tangerine orange with IROC decals and hood
1987 IROC wheels with Goodyear GSC's
305 from 87 IROC with 1994 LT1 cam (203/208 .450/.460")
performer intake
Qjet from 73 Olds
dynomax cat-back, gutted cat
no emissions controls --> passed emissions testing
non WC T-5 with 0.73 5th
3.27 nine-bolt

I was told by a reputable https://www.thirdgen.org/messgboard/wink.gif junk yard that speedometers will read the correct MPH in any cable driven aplication. Electronic ones on the other hand will not always work unless thier application specific.
I would love this 140mph speedo thats sitting at the junk yard but the milage on it reads twice as high as mine https://www.thirdgen.org/messgboard/frown.gif.
SSC https://www.thirdgen.org/messgboard/smile.gif

Thanks for all the help!

The IROC one looks to be mechanically driven. I should remember taking it out, but I don't https://www.thirdgen.org/messgboard/smile.gif. I was just worried about a change in the years somewhere, but it sounds like a go!

Now I've just gotta change the drive gear on my output shaft to get ANY speedo to read right...

thanks

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Clem
SCCA TransAm Series Race Mechanic/CrewChief
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1983 Z28 with LG4, 5 speed, and (unfortunately) T-tops
1983 Z28, NO T-tops, (unfortunately) Auto Transmission (hopefully not for long)

82-89 Camaro speedos are cable driven, and they all interchange. Firebirds went to electronic in 86.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

SSC, just turn the mileage back. It's not very hard to do.


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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, currant red metallic paint. Lots of other stuff...
82camaro
http://64.21.218.145:85/smallcamaro.jpg