Hey, guys. I have been helping Paul through PMs, and I just stumbled on this post. Now I know what game it's installed in.
A couple of things I've told him in the PMs:
1. NB is normal blow, which is kind of a medium, between slow and fast. Using a fast blow in place of a normal blow would always be safe, but it may end up blowing more often than it should.
2. A 250V would be fine. The voltage rating on a fuse just needs to be higher than what you are protecting. You can use a 250V in place of a 32V, but not a 32V in place of a 250V.
3. The fuse in question is for the insert lights, not the GI. If the GI is out as well, something in addition to the 8A fuse is going on with the game. Also, when an 8A fuse blows, proceed with caution. 8A is a lot of current in this context, so you're likely to have a short that's trying to burn things up.