85mph speedo to 140mph

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12-23-2011, 03:16 PM

Manic Z

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Location: Hamilton Ontario Canada

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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.

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12-23-2011, 05:13 PM

travis401

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Car: 91 Camaro RS

Engine: empty bay (for now)

Transmission: Built T-56

Axle/Gears: 3.42 stock posi disc

Re: 85mph speedo to 140mph

is it electric or mechanical?

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12-23-2011, 09:02 PM

ringo234

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Car: 89 IROC Z28

Engine: 357 TPI

Transmission: 700R4

Axle/Gears: 3.42 Posi

Re: 85mph speedo to 140mph

If its mechanical (89 or older) it doesn't need to be calibrated it's just plug and play.

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