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I’m just starting to do mine Tim, I believe Andy’s is a blue unit same as mine. The one I fitted to the400 was great to fit and works perfectly, really chuffed with it.Get one boughtSent from my iPhone using Tapatalk
In the garage pottering.... As its a few years since this came apart and I'm replacing the whole loom... Wots dis then.? Sent from my SM-G988B using Tapatalk
But you won’t need it for the M unit as it has integral protection inside. Ideally you need to mount it to something metal as it earths through the mounting points so if it being mounted to a plastic box say, the system won’t work.Sent from my iPhone using Tapatalk
If you're dead set on using the Munit in that tray I think I would be tempted to cut a thin sheet of steel the same size as that tray, mount the Munit to the steel and run the earth from your frame to the plate. Nice and tidy and keeps things held in better with less tension and vibration.