Originally Posted by John V6
Yes drill a drain hole. Water in the indicator cN damage the ecu


Don’t make the hole too small though, otherwise capillary action can cause more water to enter the fitting.

My vote would be not to drill holes but rather to use silicon grease on the seals etc to ensure that the housing is water tight.

Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 5
Teddy - 17h1 Irish Draught cross