Additional Oil Pressure Switch

Sean, I re-read your reply and think I have a better understanding.  The Rotax oil pressure sensor is a resistive device that is modulated by pressure.  The Dynon EMS reads this resistance and sends the info to the EFIS.  It generates the display that the user defines the color coded ranges.

For what we used to call an "idiot" light, we add a switch, so we either have oil pressure or not.  That's why I want to add another sensor.  I drive a Ford F-150 and I noticed the oil pressure gauge never changed, and as you know, the oil pressure is higher when the oil is cold so the pressure tends to drop somewhat as it heats up.  After a little investigation I realized that Ford was using an on-off oil sensor and driving a gauge with it.  Kind of dumb if you ask me, but that's what they do.

Hi John,

Random thaughts;

".....so we either have oil pressure or not"

I can see this being very simple but would it not be better,  to know that pressure is approaching (ie you select a safe minimum  pressure at which warning light goes on) a lower limit, rather than  "pressure or not"

Pressure "...not..." has sudden engine failure connotations.

Approaching may give you valuable time to decide on a life/engine/aircraft saving strategy.😈