Can I fit a throttle to a pedal assist Viking Gravity ebike?
If yes what is needed other than a throttle?
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It's going to depend on several things:
If you can't get a suitable kit, you either need to be good at electronics (design and assembly), or pay someone who is.
I've sketched out a design in the past (on paper - I don't have them any more). Here it is, with some other options.