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Replaced Kavlico fuel pressure sender. Test flown. The plane returned to normal operation fuel psi. Assume the problem was the sender and it is now fixed! (If I don't repost again on this thread... the sender was the problem.)

Dynon D120 with Kavlico 15 psi sender on Rotax 912ULS. Experiencing gradual increase of indicated fuel psi on taxi all the way to upper limit at 8.7 psi. (Normal is about 4.5 psi on taxi and 3.5 psi in cruise) Tried replacing the mechanical fuel pump... same problem. Sender issue? Thank you!

Original VDO sender: occasional fuel pressure warnings, becoming more frequent. New VDO sender: same as above Mechanical check gauge: consistently showed 1 psi over VDO New Kavlico sender (15 psi): 1) consistently shows about .5 psi over VDO 2) fuel pressure fluctuates at cruse 3.4 to 4.4, in...

I answered my own question... there's a 9 pin RS-232 on the wiring harness to plug into.

I'm confused as to whether I need a 9-pin or a 25-pin USB to Serial cable to upgrade firmwear on the D-120 EMS? Everyone seems to have the 9-pin cable, yet the illustrations for the device show a 25-pin connection on the D-120. If I can use the 9-pin, where do I plug it in? Thanks!