This is possibly a dumb question, but do I need to let my engine get to normal (or close to) operating temperature before I drive it? NOOB question I know.
Over on another (un-named) site, the majority of members seem to let oil pressure come up, then take it easy until the temp needle moves. Then you're ready for speed.
The diesel engine doesn't warm up "well" while idling. Put a load on it and it'll come up to temp much faster.