Ford Escort Sat Nav

i have a 1999 V Reg 1.8 TD escort and trying to fit sat nav into it, everything is there apart from i need a speedo signal, is there anywhere in the ECU/engine that i can get this signal from?
Chris G

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.