Summary

If you would rather pay $35 or $45 instead of $115 for an assembled ATU-100, you came to the right place!

Complete by using 1 button, 1 power jack, two 1x4mm and eight 1x8mm machine screws. You could also hot glue the display into place if you don't have 1x4mm screws. Note that I don't need a power on button. Plugging it in does all that. I also don't have any of the other buttons, just one for "TUNE NOW".

Assembled board with display: https://www.amazon.com/ATU%E2%80%91100-Antenna-Automatic-Screen-Components/dp/B099ZX8DF9

Kit board: https://www.amazon.com/ATU-100-1-8mhz-50MHz-Automatic-Portable-Communication/dp/B09H3CN82Z

Buttons: https://www.amazon.com/dp/B07SVTQ7B9?psc=1&ref=ppx_yo2ov_dt_b_product_details

Power jack: https://www.amazon.com/dp/B07VTZX2RK?psc=1&ref=ppx_yo2ov_dt_b_product_details

Depending on your board or kit you may also need a few female 0.1" breadboard wires.