77, here is a link to a "guide" I found on the net regarding NHLPA 93.
http://retailsupport.ea.com/tech_support/hints/nhlpa1.html
One of the quotes there goes like this:
Using Crowd Meter
When playing at home, keep an eye on the crowd meter. If the crowd gets rocking, your player ratings will be boosted one point. Keep in mind that a hard hitting game is more likely to get the crowd going. An active crowd will also increase the likelihood of fights, so you may want to bring in your heavy bruisers when the arena starts quaking.
I think that pretty much confirms the crowd meter controls the fighting, the question is, how do we raise it?