There is a handy reference at
http://forum.alfa156.net/forum/forum_posts.asp?TID=33126&KW=rev+counter
on accessing the little capless bulbs.
Removal of the bulb from its little orange socket is a straight pull.
Theyre stubborn little things to extract and it felt like the bulb would break before it came out.
The speedo takes three 286 capless bulbs.