2.9 Xr4x4's had VSS and would be easily retrofitted onto Escort cos for a speed sensor signal as it simply fits inline of the speedo cable. Assuming you still have 4x4 thats is.

As siad would be a case of finding out what inputs you have and then finding out what type of signal are sent via the sensors. find out if Vette one can be adapted or if you use ford sensors with the possibly of the something to translate the signals to the vette ones.

Rob