beatiful congratulations and thanks for the detail turorial btw if you want
So, this came to my mind, also purchased from RadioShack:
This going to make the car knows there is a bulb still there. The bulb is 12V and 60mA, so it fits my application. And the bulb is so small that it won't shine the light thru the perfboard.
I soldered the mini-lamp bulb on the line like this:
or on the board like this: