I recently bought myself a Bafang 750W motor and a Varstrom battery/display. The brakes that came with the kit come with a gear switcher, which is an issue since the original bike was a 7-speed. I have a new cable that should work, but where can I find a compatible shifter for a Bafang motor?

P.S. I am also planning on getting a gear shift sensor when I do find a shifter, but the one I found says it's in two different types, ABS Gear Sensor and Metal Gear Sensor. I'm sorry if this is a dumb question, but what is the difference and which one should I get?