Nah, sorry, no idea what it is, I guess nobody else knows either.
My dash display is wonky, if it is cold it can take up to 15mins to come on, if it is warm and sunny out it will take a few minutes the first time you run the car but will come on instantly the rest of the day.
After much messing about, research and discussions with folk who know a bit about electrics I figure it's a resistance issue as resistance is affected by temperature.
It may be a circuit component within the display that needs replaced but I am trying to check the rest of the system before I go forking out, this particular earth has me interested because the display pin outs have both an earth and an electronic earth listed.
In my belief, if it isn't a board component in the display unit, it is most likely to be an earth. There seems to be a gradual fading of the permanent positive feed after the car has been parked.
Since temperature affects it I am hunting the engine bay and this one sticks out as being pretty individual.
Most likely a circuit component but I just want to draw a line under this bit of investigation before I go for a new/repaired display.
Agreed it may be a radio suppressor but these days I wouldn't have thought it necessary given the use of resistor type spark plugs.