I have run into this problem with my C5 guage swap. the camaro program doesnt look for the data for fuel tank level or oil pressure, however this data is transfered to the guages across the serial data bus. Im going to try directly attaching the wire to the input on the guage. if that doesnt work then im going to get the PCM reprogramed with the corvette setup which will look for these inputs and transmit across that bus. I would check to see if this is something you can try