[DonRotolo]

Getting even more basic:
Connect power to the rangefinder.
Use the AN (analog) output of the rangefinder.
Connect this to an analog input of the analog bumper on the cRio. (Be sure to connect ground to the same port!)
Read the analog port (can't help you there) voltage.

Each 0.01 volt is an inch. So 0.65 volts is 65 inches.