I don't have one myself, but below is something that Tim Wheatly from iRacing posted about setting Porsche wheel up. Maybe this will help you
INSTALLATION
Please note that I suffered problems during installation. I had read in other reviews that there are some problems on installation of the wheel… I wanted to prove that everything worked perfect when you followed instructions but I found that even following the instructions turned out to be difficult… I have since contacted
Fanatec about it and they told me they have a totally different procedure for installation now which matches the conclusions I drew myself during my own struggles:
1. Fully build and mount wheel and pedals.
2. Do not use the automatic updater on the USB stick.
3. Download the latest driver manually on the Fanatec website.
4. Plug in the RF dongle before you install the driver.
5. Run Setup.exe from your manual download.
6. Calibrate the controller.
I spent nearly 1½ hours trying to figure things out the way the manual I received was telling me to. I eventually gave up and did it my own way (shown above).