Hi Jim,
The Freescale device certainly looks great. from your description, it looks like the pressure taps could be in the fuel supply from the tank (basically at the same level as the bottom of the tank) and anywhere in the fuel vent line, right?
Were you able to directly connect the Freescale to the fuel level inputs in the GRT, replacing the 'standard' SW float sensors, or did you use one of the aux inputs?
I suspect that I'm not the only one here that would like to see pics of your installation, the electrical hookup, and what you had to do to calibrate the system.
I considered and discarded the idea of capacitive sensors due to the variability of readings with avgas, mogas, mogas with ethanol, etc. If actual fuel weight doesn't vary enough with type to really affect readings, a solid state sensor like that sounds really good to me.
If you'd prefer to take it off list, PM me for my email address, or if you don't mind discussing by phone, your phone # & the best time to call.
Thanks,
Charlie