In the world of telemetry its always better to have each input on own lines.
Lm32 works great for temp inputs, wall tranformers for the voltage inputs
I use 3 v for resivore full, 6 v for pump on , 9 v for buckets full. If you keep the negitive common to all works fine. Temps grow room, grow room exust, outside temp, clone room temp.
The ph and co2 ppm are millivolt output , its always best to use twisted pair. I use a 39 wire cable as it allows lots of outputs for relays and inputs for temps/ppm/ph/co2 ppm. The one thing I do not like is automatic ph and ppm , any small screw up and dead plants. Unless you spend $$$$ on a dosing systems. Note lm32 is set for a 74 deg of +- .1 % so it will not be off far at 95 d.f.
Have fun OHMS OHMS I feel the power