I had a pic. of how to set a tester up but lost it when my computer went down. You use a 9volt battery, a 5 volt resistor, and a digital ohm meter (fluke meter). I think fomoco's stats are correct. You also need a screwdriver with the whole in the middle like the ones used for oxy. sensors. You feed it 5 volts and then read the ohms with the throttle at rest and wide open. You also look for a smooth increase as you open the throttle.