I bought my projection unit used and when i opened the box (it has damage from the fuel coming out and frayed the box open) there were only 2 of these bolts. Now i am not the sharpest rock in the room, but i don't see how 2 of these bolts would work. Do i use my preexisting carb studs? or do i need 2 more of the ones shown? Also, does the ProJection come with its own coolent temp sensor? Even if it does/doesn't, can i just use my autometer sensor and splice into it? TIA!