An interesting thread on qrz.com of converting an older set.

[VK3ZYZ]

This was an interesting thread.

https://forums.qrz.com/index.php?threads/tentec-argosy-525-digital-upgrades.854081/

Jeff, WR2E had contacted me because of my Arduino VFO posts on SADARC for help with his Arduino VFO.
His journey make pretty interesting reading.