Hey all! Can confirm this app works on an 18 Red needle GS. I have not switched themes, but I have messed with most of the settings and checked the functionality of most of the pages. There are a few that dont work at all, most specifically the Drive Summery page's, this shows after you turn the car off and is supposed to tell you the fuel used and milage of from your drive, there is also an info page for this that does not work. However most of them do! Can confirm the Speed Limit sign can be enabled, it must pull from GPS, the map software in my car has not been updated, and noticed some parts of roads have the wrong speed limit from many years ago.. otherwise though, it worked great. I love having the performance pages! I can try to check certain things if anyone has any questions. I want to try getting the Opel Camera module and see if will recognize speed limit signs... but thats a future project.
This app is everything i've wanted.. and more!