Pat Hasler:
It looks like a modern version of a ‘Tachtrack’ which we used on Fed Ex in the late 80’s and throughout the 90’s. Ours were supplied FOC by Fed Ex at my sugestion which they took seriousand so every driver in the Crick / Rugby area got one, in fact i got two because I transfered from one contract to another and so they gave me another.
Anyway … back to the subject, you need to download an instrution manual from whatever site you can find, orriginal tachtracks had to be re-programed every time the batteries were repalced and without the manual it was impossible.
Pat, I still use my TachTrak!!! Change the batteries once a year and it is still going strong.