As requested here's some info
The engine cover just pulls off. This is a view of the Maxchip connected, follow the Maxchip box cable on the right to the end of the commonrail (the 5 silver nuts) on the left and you will see the connections.
This is a close up of the connections. 1 originally was connected to 1a. So you are connecting 2 & 3 inline.
This will be very clear when you get the Maxchip box, the connections cannot be wrongly fitted as they are male & female so don't worry.
This is where I tucked the Box to keep it neat & tidy.
The Box is set at a standard number 3 out of 1-9 so you have to open the box to change the setting to your liking. I set mine at number 6. Beware number 9 is MAX and quite viscious.
I have driving with mine for about 1000 miles without any problems. I drove the last 340 miles an B roads (all flat roads) and is returning an indicated 48 mpg. Please note, this is managed driving, you will notice the first couple of millimetres of throttle is quite responsive, any more throttle will use a lot more fuel. Try it before you mock it. This applies without the Maxchip as well.