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85mph speedo to 140mph

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Old 12-23-2011, 03:17 PM
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Car: 1985 Camaro IROC-Z
Engine: 350
Transmission: GForce T-5
Axle/Gears: 10 bolt 3.73 posi
85mph speedo to 140mph

Hey guys.
How do i recalibrate my new 140mph speedo to read properly.
It still sweeps like my old 85mph speedo.
Old 12-23-2011, 03:48 PM
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Re: 85mph speedo to 140mph

Not sure about "sweeps"... but no recalibration is required.

Doesn't matter what the #s on the dial are, they're still both 1000 revs of the cable per mile. I.e. 1000 RPM on the cable = 60 mph.
Old 12-23-2011, 04:31 PM
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jmd
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Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: 85mph speedo to 140mph

Yeah, 1001rpm @ 60 is the calibration standard.

If you bought it used, call them on it.
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