My post is for some members were having doubts when it came to swapping the LCD because there are two different versions.Why? what's the point in doing that?? On top of that you own a EX not a Si so now you have your red effect just have the Si lettering. Don't do that. Get a custom Guage made like I did from blackcustoms and they can make what you want custom to any thing you want
Hence red Guage with perfect readings with no lettering unless you want it
Just want to thank everyone who contributed information in this thread!
I was able to swap an si tach and speedo in my lx-s sedan because of this thread.
I can confirm that a couple pins need to be swapped to make this work on a sedan.
Also, its possible to swap the lcd screens from a stock si radio to an r18 coupe radio as well. You can then plug and play the coupe radio in a sedan if the red radio screen is desired as well.