http://www.reddit.com/r/starcraft/comments/qn94r/select_hotkeys_his_engineering_bays_with_his/

Pretty simple idea: put tech structures on the same hotkey as your CC/Nexus/Hatch. That way, you always get reminded about upgrades when you go to macro.

I was trying to put all of my tech on “7”, but I inevitably forgot to hotkey them as well as never checking them when they were on there.