My Engine and Flight System manager is designed to take four analog sensors on the main module. I have added a low range differential pressure transmitter to channel 1. This transmitter is calibrated for 0 to 25″ water which equals 0 to 195 knots/hour. The speed in MPH is calculated in the manager as MPH=SQR (“H2OX1980). I tied the high pressure port of the transmitter to the pitot line from the pitot port on the wing and the low pressure port of the transmitter is connected to the stock RV9A static ports on the aft sides of the fuselage. I’ll use a manometer to check the accuracy of the Dynon and this transmitter with the Engine and Flight manager this week. The bottom picture shows the tranmitter in relationship to the auto pilot servo motor.

Update March 10:

I didn’t get to using a manometer to verify the accuracy of the the two airspeed indicators (Dynon and my flight system manager) but I did apply a low pressure to the pitot line and then valved it in. Both indicators read within 2 to 4 knots of each other at a variety of different pressures (speeds). Left blocked in, the readings stayed solid for a few hours, indicating no fitting leaks.