Hi All
So doing the same install in this speed3, the member wanted to keep his LCD screen so here is the way I did it.
1. First off when you remove the deck there are three harnesses and the radio antenna, the harness on the far right with the black fabric tape is the harness for the LCD. Note this as you will re-connect this to LCD when complete.
2. Connect stock deck and harness back to the car and set the time then ONLY DISCONNECT THE OEM DECK NOT THE LCD if you disconnect the LCD again you'll loose the time setting and have to take everything apart. Just let the LCD hand there while you work on the mount.
3. Now I removed the bracket from the OEM deck (very easy to do there are 8 screws to undo. Once screws are gone just slide the bracket off the face plate of the stock deck will come off don't worry this is normal.
4. On the top of the harness are two (ears I call them) this is what I used to mount the LCD harness back to the aftermarket deck.
6. Now I did a test fit and found the LCD sat too far forward if I mounted it to the screw holes used for the dash kit so you can see above the engraved square I carefully drilled out a hole that was already there to make it a touch bigger.
7. I cut them out and mounted them to the deck and then mounted the dash kit on top if them. If you look behind the dash kit you can see the size of the pieces I cut from the original bracket in step 4.
8. Here is the LCD mounted.
9. Here it is installed.
Not saying it's the best way but it worked for me.
Feel free to ask any questions.