No voltage coming in(outside pins)? Or no going out(Left and middle pin)?
If no voltage across outside pins do you get voltage from left pin, and your neg meter terminal to ground? If so you have voltage going to sensor, but there’s nothing coming out, I’d have to assume you have a faulty tip over switch if that’s the case. If there’s no power going too the sensor at all it’s time to check fuses, and wire connections from the source to the sensor. ( I’d isolate the tip over switch from the bike, and bench test it with a known 12v source) If it passed the bench test, and you can’t find the fault in the wiring, and you wanted to confirm that this is causing your no prime condition you could then run a fused jumper to the hot side of the tip over sensor and see if the bike will prime. (THIS IS A TEST NOT A FIX, ONLY DO THIS IF YOURE VERY COMFORTABLE WITH WHAT YOU ARE DOING, AS ADDING TEST LEADS INCORRECLY COULD CAUSE DAMAGE TO THE BIKES ELECTRONIC SYSTEMS) Electrical gremlins are extremely frustrating, and you have to be very methodical in your process of elimination. if This is getting beyond your comfort zone, do some reading on diagnosing electrical faults, watch some videos or take it to a pro. I spent months chasing down an intermittent electrical issue on my ZRX, it would start fine and run then would crank and crank and not start. I tried TONS of things, checked switched, checked connections Swapped out batteries, and ecu, (thought it was dying when hot) in the end it was a hidden loose 2 pin connector that went from the clutch switch to the wiring harness, when it was vibrated open no start, when jiggled closed, ran perfect... Long story long... these things can take lots of time and head scratching to find a result.
If that wasn’t the problem and your voltages aren’t in the ranges stated when your checking the left and middle pin (output voltage) do you not get any change depending on tilt angle? Or is it just no output voltage? Again if it’s failing these tests it’s a faulty tip over sensor, and need to replace.