[DeTomaso] Speedometer Calibration Problem GT5-S Amerisport 1987

[JDeRyke at aol.com]

Your problem as outlined by Julian and Thomas can certainly be corrected 
using all-stock parts- at substantial cost, so depending on your economic 
status & how handy you are, a major Pantera shop will have these parts 
available, or they can do it for you. Alternatively, there are in-line cable 
gearboxes available thru many big speedo-only shops in larger cities that can 
correct such things. The Police use these- oem speedos are inacurate on all cars 
but they must have certified-accurate ones to write valid non-radar speeding 
tickets. Hall Pantera used to sell one for his giant-wheel adaptions- dunno 
if they still do or whether they have various ratios available. 
Finally, if all else fails, a programmable electronic speedometer with its 
face changed to match the other gauges, can be installed. Autometer makes 
one commonly used. Note- this will eliminate the stock speedo, the drive cable 
and the angle-drive but cost close to $400 by the time you add a sender and 
wiring. You can sell the stock parts to defray most or all of the cost of 
the Autometer. Once installed the Autometer is reportedly very accurate and 
trouble-free, and can be re-programmed at any time if by chance you change 
tire diameters in the future. Those are your   options- good luck- J Deryke