I had a Nu-start NUS-2000 installed in my truck. It works great. I had it installed by a guy in town, and it was a very basic install. He did use the tach lead from behind the instrument cluster, and also had to tie into the "Wait to start" light so it knew the delay for the glow plugs.
I wired up my high idle control to the trunk button, since it wasnt being used anyways. I start it, let it warm up for a bit, then engage the high idle. It took some work to get the pulse output of the trunk release to work as a constant on, but once I got that figured out, it works great.