Update: yes it works on a Cali 1400 Custom build 2013 too!
Not that I doubted Vizir
I took a slightly different approach. I ordered the spare L+R Hand Grips Grips (OF691T7 & OF691C6). Makes no sense to buy a controller to throw it away.
Installation was easy, no glue or heating required. Both left and right grip were a tight fit and could be moved over the handlebar with some twisting and pushing. I only needed to remove the ridge on the end of throttle (used a hobby knife for that):
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Since I had difficulties to order the molex plugs I decided to replace the MG side with the same type of connecter that the Oxford Grips have. If in the future one of the Oxford grips fails I wil ba able to replace it without changing plugs. For the ones willing to go the same route, the connector you need is: L6.2 6.2mm Plug (female). Also referred to as L6.2 2p, L6.2 2.0 or sometimes KET 2p Tamiya style.....
Then Vilim messed up my plans by announcing there might be a Piaggio solution that required the original connectors to be on the Guzzi.... To keep all options open for the future I decided to grab me the Molex connectors too and just make an extension cable with both types of connectors:
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Works perfect. The grips heat up very fast in mode 3..
If someone wants to go this route then I can make one extra pair of extension cables with the remaining connectors I ordered.