When [Andrei] first got his Raspberry Pi he wished to make it a standalone computer best away. This implies the normal input gadgets like a mouse and keyboard, but also some type of display. To avoid waiting for shipping he ended up using a low-cost car backup video camera screen from the local big box store. It worked great, and recently he chose he would try to convert it to run off of 5V power to simplify his setup. While snooping around inside the device he found an unused resistive touch overlay and figured out how to get it to work.
What tipped him off is the small four-conductor connector which wasn’t hooked as much as anything. He thoroughly soldered wires onto the flexible circuit traces, then generously covered them in hot glue to help avoid movement from breaking the stiff connection. To get this working you need to measure the resistance between the conductors. many of the time we figure the RPi GPIO header can be used directly, but for this task an intermediary is necessary. [Andrei] went with a small Arduino clone board. A bit of trial and error was all it took to get the connections best and to iron out the code which equates the values into coordinates.