Multiplier translation

Ok, I have a T-bred 1800 which I cut the fifth L3 bridge on to release the multis over 12.5. The thing is now I dont know what multi im going to get. If I coose 12.5 I get 16, and if I choose 8 I get 16. The rest so far are unknown. It wont boot at 7 which is also supposed to be 15 in this case. I may have cut the 4th L3 as well because I went as bit wide with the scalpel Anyone know how to work out what you are going to get with this configuration?