Ah, I reread the part about going across the power and signal. I’ve never used a pull up resistor. It may help with my driveshaft sensor. What air gap is your setup running?
I've never measured it, but probably a credit card thickness. I just made wheel speed sensors for my car and used the DIY hall sensor with the single hole mount. Those instructions say 5mm, which I did end up measuring because the brackets I made are not adjustable. Those worked flawlessly reading the back of the wheel studs. I'm using digital inputs for these though, not a VR input.
