I've got a 2015 Nissan Leaf and I've been contemplating installing the OVMS module. The car was initially a lease in the US and brought to Canada once the lease was up, so there are issues getting the native Nissan Connect app working (i.e. registering the VIN). I've heard that the app isn't spotty at best anyway, which is when I stumbled upon OVMS.
This afternoon I removed the glovebox and was wondering if anybody had tried using the existing GSM antenna that is plugged into the TCU. If not, I might have a look around to see if I can make an adapter cable unless there is some other gating issue.