Thanks Walter!
I already have an Automatic Pitch Controller that keeps the sub level and just wished to display the pitch angle as well as the roll angle. Things like "look-up tables" are completely foreign to me and trig math just seemed to complex. Maybe I am just looking at the wrong type of sensor? I saw the electrolyte type and apparently they do not like DC. It also seems silly to buy another Automatic Pitch Controller just to read the roll angle. Best, Ed