Yes you are correct. It is the Apexi turbo timer.
I installed it myself and it was a very easy install. Well, with the help of a wiring harness.
If I remember correctly there are 3 main wires coming out of the central unit for the tt(turbo timer)
1. A group of wires which easily plugs into the wiring harness
2. Wire that hooks to your E-brake
3. Wire that hooks into your ECU to show the Air/Fuel mixture.
I didn't hook up the air/fuel mixture cause I'm not ready to mess with my ECU yet. But just hide the central unit in the dash and drill a hole (covered with a rubber gromet) below the ash tray, connect and your set.
Try doing a search and you will get alot more details.
Hope this helps