OK, here goes...
First a disclaimer. We a couple test bikes for development purposes. We don't regularly take them out, get them muddy, and wash them. So we have not had water ingress issues because we simply don't put them under that kind of stress. If we did expose them to "water ingress stress" i would not be surprised if we had issues. Personally I would do what I describe below. I just want to state I haven't actually done it -- want to be transparent.
It was very important for the wiring to be "visually clean" to present a look of "premium". As an example you have a little enclosure behind the number plate where the connectors for the map switch, docking station, and throttle are. This enclosure does nothing for sealing; its purpose is to give a "tidy" look.
For this example I will use a throttle:
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Notice that there is heat shrink tubing covering the wires from the end of the sheath all the way up to the connector. This is not good because it bends the wires inward at the blue gasket and reduces the effectiveness of the seal. A common way for water to get into connectors like these is at the rear gasket. The heat shrink can be cut away making the individual wires visible. After the the heat shrink is removed the wires can be straightened improving the rear seal. This also allows us to carefully pull back the gasket using a small flat head screw driver.
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It is now possible to use silicone to seal this, but I wouldn't recommend that unless you have experience doing this because if it ends up on the pins it will ruin the connector. If you do use silicone make sure to use silicone that does not have acetic acid as it will ruin the contacts; use silicone that is compatible with electronics. My advice is to use dielectric grease.
At time 55 seconds we have an IP rated connector where moisture penetrated through the rear of the connector. This round connector has a rear silicone gasket seal just like the white connectors on the varg. Notice for that proper seal integrity the seal around every wire must be good. IMO, even if this seal isn't perfect it will do a good job of keeping the dielectric grease inside and the grease itself solves the moisture problem.
Note that dielectric grease is NON conductive! But that won't prevent a good electrical connection between the pin and socket:
So in short:
1) Carefully pull back blue gasket and apply grease to the rear of the connector. Push the blue gasket back.
2) Apply some grease to the contacts themselves (as seen in the video).
3) Re-mate the connectors after grease has been applied to both sides. If the connector will not fully mate then there is probably too much grease inside and we have a "hydraulic lock" situation; remove a bit of grease with a tooth pick and try again.
If you are nervous about step #1 skip it. Some grease is better than none.
In short, we give up on using the connector seals to keep the water out. We use the connector seals to keep the grease in. We rely on the grease to protect from water.
I also wouldn't hesitate to try out grease inside the map switch itself (on the PCB even).
Let me repeat. I didn't do this myself. It is what I would do if I had this issue. Also, this area behind the number plate is not the only water ingress weakness the varg has.