Do you mean the red light on the temperature gauge ? If so then welcome to the world of dodgy sensors ! The light may flicker on if your coolant level is below the minimum mark so check that, if that's ok then as long as the oil temp on the MFA display is within level (not greater than 130+ but you should never get close to that.ÂÂÂ

) so it should run around the 96 - 110 mark normally, but dont worry if it gets higher as I've seen mine at 116, and as long as the temp gauge is just before halfway then you should be ok.
My cab has random flashes from the this light and I've just bought a Rallye that does the exact same thing.
P.S. You don't need to post in the maintenance section as that is more for how to's etc, if its a general question just ask it in here.