Display Vdd

[davesatu]

Hi all. Newbie here so please be gentle. Using a 16F876 and 2.45a. Want to display Vdd on an up and running LCD. Can't figure it out. When displayed Vdd will then be adjusted to exactly 5 volts to be used as the reference to convert and display an input voltage through an ADC pin. A test 3 volt battery ADC input works well even to 3 decimal places but uses actual Vdd rather than 5 so this question.

Am I on the right track or is there a better way to get a correct ADC voltage on screen? LCD Pics here. Should mention the 4 shown at right hand bottom is a toggle from 4 to 8 when you press the Ohms button. It's a relay for this project.

Any help much appreciated. tks Dave.