Sensor Wiring

[John C. Alsina]

 I want to use an LM34 three-terminal temperature sensor to measure engine 
coolant temperature.  The sensor can drive about 50pF.  Let's assume 3 to 6 
feet of wire between the sensor and the A/D input on the CPU board.  That makes 
a nice antenna to pick up ignition and other noise and trash my sensor reading 
and maybe damage the processor.  What's the drill for wiring/conditioning such 
a (slow-moving) input? Use resistance in series and capacitance across the 
sensor and the A/D input?  Should I use shielded cable?  If so, how/where do I 
ground it?  Need a practical solution to a practical problem. Thanks for your 
input.

John Alsina