Diesel tuning chip

[boabcelt]

Howdy folks, I have a 09 plate 308hdi 90, and I have bought a tuning chip which needs to go in-line with the common rail pressure sensor. Now, I was a bit daft with this because my last motor had the common rail on top of the engine, and easily accessible.I naievely thought that this was the case with al engines I believe that common rail is to the rear of the 1.6HDi, so how do I access this? Can I do it from under the motor? Any help or photos would be greatly appreciated.