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they really $42? guess i should of asked where he got it my bad
I actually got a G35 seat switch instead of a G37. I got it because it was cheaper ($20 on ebay) and looked slightly different from our switches. I chose the seat switch because it has 3 button position. I used the forward click to energize the relay and switch to stock navi, neutral position for regular car computing, and third click energizes the rear backup camera. So now i can drive with the rear camera on.
If you simply want to switch between navi and computer, you can get a 2 click button. The best option for this is the snow button that comes with the G37 6mt Sedans.
The software is called Dashcommand by Palmer Performance. I have a carpc running windows 7 and running this program. The dashcommand program receives some of the data from a OBD reader. Other information (boost, egt, and oil temp) are provided by PLX Device Sensors.
Where are you getting your AFR from? Is it off the OBDII or a seperate wideband sensor that you installed?