A pitot connection alone cannot give you total energy. In fact, it gives you backwards total energy. Kinetic energy increase results increased pitot pressure yet potential energy increase is associated with reduced pitot pressure. This problem can get resolved when you also connect to a static port and do the math.

Now, pitot ports are fairly foolproof and always give good signal. But, not so for static ports. Static ports are easily fooled by changes in AOA and yaw. On fuselage static ports are usually hopeless for use in delta P varios. The best bet for a static port are those tied to a modern triple probe. And that begs the question: why bother if you are going to install a modern triple probe anyway?