Thanks Brian!
Yes I noticed that depending upon the PIC there is only one pin marked as CCP2. My guess is that by using HPWM the PIC knows to use this pin and it still must have a hardware definition? MCLK is shown as a comment so it has been confusing to know what to do for the hardware defines. Another thing I did not understand is why use CCP2 and not CCP1?

For 3.3 v to 5.0 v conversion (bi-directional) a device that does this known as the ADG3304 if this is of value. The device can also be used for other voltage level changes.

Variations in atmospheric pressure causes the zero reference point (the surface of the water) to change so to maintain accuracy a simple water detector (two transistors) could be used to set the zero reference (surface) point.

Thanks for answering and hope I have made some small contribution to you and others.

Ed