Need a guide for ultrasonic install

Can anyone provide me with a guide for setting up an ultra sonic sensor as a forward facing obstacle avoidance piece? I have a 2.1 cube on APM 3.6.3 and I am getting ready to install a Lidar for terrain following and I also want to install an ultrasonic sensor I bought to detect forward facing obstacles. I can’t seem to find much on it, lots of setup guides on a forward facing range finder, but no ultra sonic.