My DEFI gauges have a little start-up routine which lasts about as long as it takes for the revs to settle. I turn on the car, wait to check if the oil pressure and vac levels are good, and then off I go. Tend not to go above 4000RPM until the coolant temperature has passed through 50-60C at least. Best give a chance for the oil to start flowing and make sure everything is nice and lubed.