A little more research. I re-downloaded and reinstalled...
(1) I should have said <Shift> + M not <CTRL> + M but makes no difference.
(2) If I start the engines with <CTRL> + E and then toggle the Start Magneto switch, the oil pressure and temperature gauges function which ever way the start magneto switch is set. If I then shut down and restart using the manual start method all appears to function correctly.
(3) If I use the saved flight mentioned above to provide a starting point, I can start manually and then toggle the Start Magneto switch, the oil pressure and temperature gauges function.
So, in conclusion: there's something odd in there but I can make it work, so all's well, I guess.
Anyway, in spite of this, the 621 and Tutor are on my list of favorites now.
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