Don,
What type of system do you have (s or non-s CPU)? Can you tell us your serial number? To turn a unit off after master power has been removed, press and hold button 2, 3, 4, or 5. Button 1 provides a hardware path to apply power to the unit via the battery. Pressing button 1 along with other buttons can cause unpredictable results. Please help us know more about your unit so we can help diagnose the issue and get it resolved for you.
Most likely the cause of the oil temp changing from internal battery and aircraft power is not having a good ground wire to the EFIS case ground screw or a bad engine case ground wire. Do you have a ground wire connected to the case ground screw on the back of the EFIS?
What version of software were you running?
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