Electronics International M-1 Manifold Pressure - Manual (Page 9)

Check Instrument Operation:
Check instrument operation as follows:
1. Turn the master switch on (engine off) and verify that the instrument sequences through all the analog
lights and reads approximately barometric pressure less .1 inches of mercury for every 100 feet you are
above sea level. A problem at this step could be caused by poor connections on the red and/or black leads.
2. Check the digital display backlight. With high or medium ambient light it is hard to see the digital display
backlight (it is only required during low ambient light conditions but should be on all the time).
3. Start the aircraft engine and check the digital and analog display to read properly. A problem at this step
could be caused by a restriction or leak in the manifold pressure line. Never pressurize this line with the
M-1 connected. This will damage the pressure transducer.
7 Rev. A: 6/16/92