Update I: The LED now works correctly, thanks Mr Heliks for the input! Update II: Making the CMD button work has been an interesting endeavour.

Update I: The LED now works correctly, thanks Mr Heliks for the input! Update II: Making the CMD button work has been an interesting endeavour.
A friend I met on Sabre Squadron’s Discord, Ali, spotted on Ebay a bunch on unserviceable old TACANs, previously used on RAF Jaguars. He bought