Hey Ken,what do you think about this cicuit for my electrolytic sensors?

Edited to add:
I ordered samples of the LCD and ADC from Maxim. Can you help me decide which PIC I need. There are too many choices when I put in PIC16C54C with Microchip.com
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"The trouble ain't that there is too many fools, but that the lightning ain't distributed right."
Mark Twain