A simple way to transfer the pager number to the screen, down load a digital font to your pc. In word or publisher, print out the font, should be a 12.5 to 13 size font depending on the individual font. 415-494-8007 on an ink jet printer.
Once it prints out, take a piece of clear scotch tape and gently press it to the print out on the paper. Carefully pull it off, it can lift the paper off if you press too hard or are not careful in pulling the tape up. It should pull the ink onto the clear tape.
Set the tape against the pager window, lining up the lifted print. Remember, the number should be facing down towards the clip. Use an exacto knife to carefully cut the extra side off, watching the tape up to the sides of the pager window. Use a dull knife edge to carefully push down the tape so that there is no fogging or bubbling from the center to the edge of the pager window.
You should have a nice fake pager window showing the screen number.