Hello GM

I like to use the 16F819 for the same reason.
It makes no sense to try and use a 4Mhz external osc as the 16F819 has it all build in

Have a look at my LCD Dash project
www.skidloaders.co.za/pic

I am answering your question as I am looking for help myself.
Nl. My ADC results displayed on the LCD are jumping around
Both the numerical values as well as the bargraph.
All this on the breadboard ( see LCDDASH2.JPG)

Looking forward to anyones assistance.
Wilfried