Escort (UK) digital speed backlight

Hello everyone.
I have a strange thing going on with the back light on the digital odometer read out on my escort.
Every so offen the back light will go off for about hald a second and them
come back on again.
Does anyone know if this is a ford "easter egg" or does it indicate something else?
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.