[Continuing on from the above.] The problem of two flickering LEDs on the 'charge' dial came back after about an hour of driving.  Later, I removed the instrument binnacle again, and carefully re-soldered the connections to that pair of LEDs, and re installed it all back in the car.  After a couple of hours use, those LEDs are without problem so far, but the other 2 LEDs that illuminate this dial have started to flicker instead.  I am interested to see if this problem is a solder joint issu