Solved
Burglar Alarm says “missing an upgrade part” there are 2 in inventory
Ever since adding the burglar alarm to my save, I have been able to upgrade to “perfect the inner workings” and “police link security upgrade” but I am not able to add the “take that! Shock upgrade.”...
The tool tip says what extra you are missing, not what you need as a total. For that upgrade you need 3 electronic parts, which means that you already have 2 electronic parts but need one more to do the upgrade.
