thanks for your reply,
For the K sensors, I intend to use a RC and OAP.
Your idea to convert into digital sounds nice, I will investigate with I2C
I've found 'Analog/Digital MUX Breakout' on SparkF, with 16 AD ports which seems to be very easy to use. ( still missing two AD ports but I can use those on the UNO, so my problem seems to be solved at this time.
regards,
Phil