85mph to 140mph cluster

[87foxgt]

So im putting in a new speedo in my 87 fox gt and as long as i got the cluster out i was thinking of switching to a 140mph. my question is do i have to tune to speedo or will the new cluster do it for me ???? and yes this may be a dumb question but i had to ask thxxxxxxxx

[silverstangboy]

just swap it out. and enjoy

[ProjectPunisher]

from wut ive heard u need to have them calibrated...

[silverstangboy]

calibrated from the factory

[94Stang504]

....

[1234]

it not calibrated from the factory for the 140mph it is for the 85. So yes you will have to get it calibrated

[silverstangboy]

you will not need to calibrate it, it is not a digital deal, it is mechanical. i've been running one for years now, its right on the money. the gear in the tranny does the calibration for gear change.