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There is a 9P black connector that has a Red/Green wire in it. That is the 12v supply to the cluster. Fuse "F" protects that circuit. Check to see if you're getting 12v to that wire when you turn the ignition key on. Actually, now looking at the wiring diagram more closely, it should have 12v all the time. It keeps the clock and trip meter running. That entire circuit is protected by the main 30A fuse that is in the Starter Relay Switch by the battery.
Yes you could. If it works, then look for the cause of there not being 12v there. I would not recommend leaving a bypass in place due to the potential for a short and fire from an unfused 12v supply running through the bike.