All the details of 'Shimergo' setups are here http://www.ctc.org.uk/desktopdefault.aspx?tabid=3946
You need any 8 speed Campag Ergos with a Campag 8 speed rear mech to work with a 7 speed Shimano cassette,
You dont need the 8 speed cassette, as shimano 7 and campag 8 are both 5mm spacing. you just lose a gear, so the ergo would only operate 7 gears with a redundant click. You can use a 9 speed rear mech also, providing its a 1st generation campag 9 speed, commonly known as "20th century" as opposed to 21st cent.
Also, if youre prepared to go down to 6 speed, the shimano 6 speed cassette and rear mech will work directly with the 8 speed ergos. I've done this for a number of years, but 6 speed cassettes are getting rare. note that 6 speed cassettes have a wider spacing than 7, its not just a case of losing a cog.
A bicycle can't stand up on its own as it's two tyred