Problems w/Eagle Tree OSD onto DJI WKM/Flamewheel

Hello all,
I've someone completing a flamewheel 550 for me equiped with DJI/WKM and we're attempting to install the Eagle Tree OSD pro onto this system. For what I'm doing I have to have Lats/Longs as well as compass/direction orientation and accurate altimeter, thus the reason for choosing E.T. Pro. The E.T. pro system had been on another aircraft and it had been crashed before but my expert says that all has checked out yet can't seem to get the E.T. to work at the same time the WKM is working and visa versa. I don't have to use E.T. other than I've already purchased it and don't want to spend the bux on something else to buy/add on. Does anyone out there have any insight as to whether there might be a compatability issue between E.T. and WKM. Is there another OSD system that will give me Lats/Longs, orientation direction and altimeter that I could use which might be more compatible? Thanks for any input and have a great day.
Bert
 

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