I have a Novar IOM with 2 wires that go to a IMP1010 transducer. I looked at a transducer that is working OK to check the signal going to it but can't figure out what the IOM is sending it. It does flash some resistance when the output light is on but I can't really read it. If I jump the contacts on the IMP it bleeds pressure - so how does it build up pressure? I've tried jumping and manually pulsing the input but nothing. How do I check the signal from the IOM and how do I simulate it at the IMP to check the IMP.