Circuit Breaker on Ammeter Bypass

I'm doing the typical ammeter bypass using a fat 8 gauge wire from alternator to starter relay (overkill?). I want to use a circuit breaker as opposed to a fusible link, so I don't have to worry about having a spare. Is this a good idea? What is safe amperage for 8 ga? I'm thinking of something like this:

http://www.summitracing.com/parts/bss-cb185-50/overview/