I just plugged in the manifold pressure sensor on my Vision Microsystems EPI 800 engine monitor.  The digital display is acting weird.  As background, the sensor is not connected to the engine, so it should be measuring ambient pressure.  I am in Denver so that's somewhat lower than 29 inches of mercury. 

The "pointer" around the outer edge of the dial reads 25 inches, so that's good and appears to be working.  The digital display has six digits, and they read "88***8" where the asterisks indicate non-numbers where some LCD segments are lit and some are not.  The fifth digit is blinking.

When I disconnect the wires from the sensor, the digital display reads "000" and blinks once per second to read "039".

I ran the troubleshooting diagostic on the sensor and it checks out okay -- voltages are very close to the limits indicated (well, slightly outside, but I'm not at sea level).

Anyone got any ideas?

Thanks

- Rob Wolf