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Could be that. Let us know how it goes with more separation of the antennas, it may help others.

More info please re connection to the Dynon system. How are the interfaces done ? ;)

Likewise-however if you have an EFIS/EMS display it is easier to just use the Red Avionics (aka Princeton) 1 - point setup - (set empty only) & then do the calibration via the EFIS/EMS screen = simple ;)

Fantastic result- seems like it’s all okay now 😃 FWIW I’ve never found grounding an issue for the resistive or capacitance units & seeing your setup I figure you did a great job with the build.

Ok - back to square 1, bear with me as I'm trying to understand your setup - Post #9 shows a resistive sensor type in an Vans RV - correct? Do you have a mix of resistive & capacitive sensors as shown in post #4 ? If yes, then please explain as a 'standard' RV has only left & Right tanks & post...

For EMS sensors it’s always better to use a ground from the Dynon EMS unit, you can pair them up if you don’t have any spare ones.😉 ps - I notice the MAP data is also fluctuating - what’s going on there ? Maybe you have other wiring issues too ?

Have you gone into Setup > Traffic Setup Menu and set the Show Ghost Targets option to NO? (see attached) Andre'

Always connect to the EIS/EMS grounds - you can pair up the grounds if there are not enough individual grounds available - that absolutely minimises the probability of ‘issues’.😉

Most likely not a wiring problem - if the network wires were incorrectly installed then you would get a message telling either 1 & 6 or 4 & 8 needs sorting & power/ground are good because it will power up & ‘lock on’ as you indicated. Are you able to swap servos (assuming you have roll & pitch) ?

Double check the location of the probe it may be in the fuel in the fuel bowl ? Don‘t ask how i know this 🙄. Suggest you remove the probe & if fuel runs out you have it mounted too low .

Maybe the shear screw is broken?

Have you checked the ADAHRS mount security ? ;)

I’ve seen the exactly the same issue years ago,cleaned the pin contacts with a soft wire brush then flushed the gunk out with contact cleaner - the EMS still works. The tip up canopies can be notorious for this IF you don’t ‘shield’ the avionics from water ingress - I’ve used heavy aluminium...

Understand it’s real hard sometimes troubleshooting online considering “We” are unable to see/know how your plane is wired. If I was a betting man I’d say the ‘fault’ is not with the VPX itself - from my experience they don’t fail unless it’s an installer induced problem. I’d recheck the serial...

Airguy pinNed it down. PH-LRV - thanks for posting the solution, it should/can help others.😉

Just in case anyone was wondering if Raybo is a scammer I can assure you he is legit - has been a good friend of mine for 30+ years. He will be in USA & can make arrangements for delivery.

Stevec, MY BAD, very sorry - know you guys 'over the pond' are normally good guys At post #7 ....see if the 'issue' is still there -IF yes, then "bite the bullet" & install a B&C Alternator - what I (now obviously) meant was to say IF no, then bite the bullet....... ;)

Bingo, I see where I went off script.🥴

All I indicated was to disconnect (the field wire plug) the alternator. Run engine. Nothing about ”Problem remains”, however if it does remain, after the above, then the “issue” obviously must be elsewhere 🙄. Never thought I’d say this, &mean no ill will, but ‘Stop acting like a troll’ you can...

"Well I have what’s called a formal education AND experience, not only in electrical engineering, but in pressure transducers" Sometimes I'm wrong, hopefully not too often, & other times I'm good - hopefully between us WE can help others find a solution to their issues. I certainly don't have...