Here's some pointers on the integrated gauges display
1. The Scangauge II option is perhaps the most cost effective, but if you like to have something that pops up automatically everytime you push in the key to start the key - this has the Wow factor and keeps the can uncluttered. Has option for Engine Oil temp and Oil pressure with option 2 sensors.
2. You willl likelt need to forgoe your existing integrated GPS system pop up screen and replace it with a GPS or non GPS pop up screen for S60. This can be sourced from www.alibaba.com search under S60 screen/LCD along that line. The GPS ones doesnt work well but may be alright for the US market.
3. For the OBDII displays which has the option for the added 2 sensors - oil temp and pressure sensors, Blitz R-Vit DS is the product that will read from OBD2 (just plug it in there) and the output from Blitz R-Vit DS is channeled to the POP up screen.
Blitz R-Vit DS comes in 2 version, the Continetal ones and the JDMs ones. Make sure you get the Continental ones as it works with Volvos. You can source this out from ebay.com.
Both the Pop up screen and the Blitz devide is operated via a remote.
So far I've channeled 3 sources to the POP bp screen a. The reverse Camera b. The DVD player via a custom splitter swtich that outputs to the rear 2 head rests and front pop up screen c. the Blitz R-Vit DS.
The combo to the above not only creates a new entertainment system for the S60R, biut gives it a 2012 refreshed cabin look and feel. Sit in 2012 sports cars and you know you have the integrated digital gauges in your S60R too