Hi, This might seem silly, but i had this on my P38 and it turned out to be water in the indicator unit, replaced the unit and it all went back to normal.

OK, so thought I would drop in an update, my mechanic tested the actual temperature of the engine and it is running perfectly within tolerances, and the thermos are all operating correctly, he has cleaned the gauge too, and it goes up to temp much quicker now and stays there, with only a needles...

Thank you so much for your very detailed reply, very helpful indeed. It is going in for a service next week so I will get him to check it, it warms up nicely and stays on the 12 o'clock all round town, it's just when the speed picks up it drops a couple of needle widths, but never back into the...

Yes

Hi, I have just bought a 2005 Vogue, after years of P38s. It starts fine and runs lovely, but I have noticed that around town the temp needle stays at 12 o'clock position, but when I go on the motorway it drops, not right down to the cold, but about 3 or 4 needle widths, is this normal? Thanks...