form 85 to 140

[spiffy]

have the 85 mhp speedo but bought a 140 for after i do my swap but i was wondering how do i get it to display the right speed what do i have to change? i have a 88 stang with a t5 btw

[NoSlo5.0]

I'm gonna guess nothing will need to be changed. If it's a replacement speedo and not just an overlay, it should be plug-n-play. If you bought new gauge faces, then ur screwed, no way to calibrate that.

[cobraspence]

You have to change the rest of the car to all cobra parts - just kidding. It should just work if you bought a direct upgrade.