To start the ball rolling, try a simple opamp (LM358) as an instrumentation amplifier and the second link from the previous post describes how to utilize it as the strain gauge signal conditioner ..
It may be connected to the 10-bit A/D pin of your PIC, but, as I said before, it is just for a good start ..
The sensitivity may be not there, so later on consider proper (more expensive) instrumentation amplifier and an external (higher resolution, say, 16-bit) A/D converter ..
Rgds,
IanP