thank you james, i have down loaded every thing you gave me to look at but i found nothing that would tell me the value of an item, for instance the air intake sensor when tested in my house started at 1.607k and slowly rose to 2.090 and still on the rise. the temp in my house is at 68%F if i hold the probe tip it falls to 1.520 and falling. So my consern is its accuracy. I have been told it has an effect on the fuel mixture, as dose the water temp sensor. again thank you for the information. Memory (JNT)