so does anyone know what needs to be done to have the speedometer recalibated?

 

I hit 280mph in my car one time. [:-] Then flipped & blew up.

 

I had a 220 kph speedo, and when it started bouncing, I put in a 180kph, and they both work fine, the speedo itself is calibrated.
you only need a different speedo gear if you change your rear axle gears, or go to a bigger tire size.

 

A new speedometer gear and I think you have to have a machine or somthing to recalibrate the computer a shop will probably have to do that like ford not sure.

 

in order for the gauge to work it has to be out of an 87,88,or 89. In 90 they had air bags and the wiring is a little different and the gauges are shaped a little different. but if the cluster is from one of them years it will work. There is no calibration that needs to be done. the only time you would need to calibrate your gauge is if you wanted to put 140 white faces on your 85 mph speedometer. then you would need to calibrate. if its from 87,88,or 89 it a total plug and play deal