You will need B, C( SMATCRAFT GAUGE ITSELF, D and E. Sherm will give you your options as far as gauges go. If you purchase smartcraft i suggest at least a level 1 monitor.
Alot of folks think on a basscat you have to have the full length cable going to the motor. Though you dont. I done this install a good while back with the listed components. I agree with himmeler a monitor is the way to go. His link explaining the options is very good. He does a great job of explaining each option very well! The install is very easy on a BCB. ITS A PLUG AND PLAY.