hamster":1r6e3pq2 said:7 speed pitch is 5.0mm for everyone.
8 speed Campag is also 5.0, but Shimano is 4.8mm.
Usually you can get 8 speed shifting to work OK with a 7 speed cassette, but is usually better to set it up on the middle of the cassette not using the top gears. The jockey float in the mech takes up the errors.
But it will be more tetchy and susceptible to dirty cables.