how much everything will cost shipped to the US? and I don't mind about oil tank, was just thinking of using the original battery bay as a small storage box? or am I just using too much imagination here?
The m-unit runs about $340 (central fuse box and ECU)
The m-button runs about $75 (control wire concentrator)
The m-lock runs about $175 (RFID key)
The m-button and m-key ar won't required. But to use them, the m-unit is. Which is to say you can't use the m-button alone with the m-unit. The m-button requires you to use suppressor wires from your coils, and the m-unit really wants a solid state regulator/rectifier, but not required. Just make sure yours is 100% stable.
The two websites I listed earlier are domestic US resellers of the Motogadget products, so there's no importation issues for you. Just like buying a TV made in Taiwan. Personally, I'd spend my money on their m-unit and one of their gauges over the RFID key and m-button, unless you have the budget for all of it.
But I will say this, the ultra small AmpHr battery that Maurice referenced would not be choice for me with a motogadget install. I find it hard to believe, not impossible, that our bikes could run with that 1.3 AmpHr battery under normal use. If he has it and says it does, I'm not disputing, but I can't see it surviving in night time riding with some stop and go. I am often wrong...
Your battery box is a suitable location for the motogadget install, but where then will you locate your battery?
Apologies Bookah for the thread jack.... Chopsticks, might be easier for you open a thread in SOHC Bikes and post some questions about your goals, and we can leave Bookahs thread alone since this is a departure from his path.