The product does what it is meant for. The Temp reading is clear and reactive. The installation is easy, but - unfortunately - I got no answer on my question upon the usefulness of the 5th pin on the digital reader. Together with the installations of a boost pin, a boost ring as well as a HP full size Intercooler my Defender 300 Tdi runs better by far with the same fuel consumption. The engine sounds less stressed, gives a deeper sound without any mechanical rattling in higher revs now. The Temp reading gives me the assurance of not overstressing the engine.