specifically I'd like to monitor the total current consumed of the 12v source, i'm already monitoring the voltage of the 12v source using a voltage divider and my pic's a/d module

Can somebody post a configuration for me to get the current consumption data? ... PIC16F872, 12v's wants to meter power into 7805, also if this is "easy" i wouldnt mind metering the current in from my solar cells which are connected... so i get Current in and out...

thanks please tell me how or point me to a working example (i've googled.. but nothing helpful besides the info i need a shunt and op amp)