This is correct. You will need to jump these two together so you have power when cranking.
"Crank Cherry Hall Effect Sensor - Requires pull up resistor. This tees into both the supply voltage and the output signal wire. Use a 2.4K resistor when using 12v teed between the VREF and signal wire to pull this up."
As I recall, diyauto only sends a 1k resistor with the Cherry hall sensor. So if you are powering the sensor from a 12v feed, you'll need to buy and T-in a 2.4k resistor.
This is also correct. The MS3X has an internal trim pot for the VR input, which I found useless. The pull up did the trick.
I'm working on wheel speed sensors using their hall effect sensor (traction control). I'm hoping that one is less of a pain than the VR sensor. It certainly isn't as easy to make a bracket for like the red threaded body sensor.