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I think the common idling of diesels is due to over-the-road trucker idling during the night in years past, either to run the heater or the A/C. Can't remember how bad it is for them, but at least on OTR tractors the rings aren't even meant to seal at idle. That's a lot of fuel and crap going...

Phil, it may be taking it to the extreme, but I don't cold start an engine if I can help it. I'll push, pull, tow, whatever it takes, if a vehicle needs to be moved. If it gets started, it'll get driven until the fluids are up to temp. That's different from letting it idle for 15 minutes...

The slow reaction of the gauge is normal, unfortunately. Never did get around to check if there's an actual lack of pressure, or just a delayed gauge. It doesn't sound like they're running without pressure...to me anyway. Oh, and the filter on a FLU is positioned correctly, tennmogger, so...