It sounds like you have the Type 1, correct?
If so, gray connects to the handbrake. You should get a harness from Justin at torqueic.com, this will make the other wires easier to hook up, directly underneath the steering colum, one easy connection.
I know the blue/brown wires tap into your computer. One taps into the RPM signal lead wire (brown), the other goes to the Speed signal lead wire (blue). To tell you the truth, I wouldn't connect these two wires. The other stuff that the timer offers really sucks, it doesn't measure things correctly, especially RPM. Just connect the gray wire, and use the harness for the other wires. thats all you really need..