I believe what you have is called a "Lonnie" overlay. Was not supposed to be permanent. Was to allow all cars to talk to the Miprom Group when modded. Not sure how much info I have on it, but we used it on an Otis A Base before a Mod. I do remember the communication wires were very different then thought and very touchy units. I am pretty sure if it is a Lonnie that you can talk to it with a real svc tool using the Lon on the tool.