Anybody got any experience with HUDs?

I bought this simple HUD from FastTech:

When connected direct to the OBDII port, it powers on and seems to function. When I connect it to the OVMS module with the standard https://www.fasttech.com/products/9652027  the HUD doesn't even power on.

It's stated draw is 200ma which afaict should be fine.  I'm pretty sure the 12V power is getting to PIN 16... though I will try again to make sure. I only have a crappy little Multimeter.

On the Troubleshooting it states:

   "HUD only available for cars with OBD2 and EU-OBD agreements ... HUD Products don't support JOBD and OBDI protocol."

The OBD HUD connector has the following pins:

4* Chassis

5* Signal Ground

6 CAN High

7 ISO9141 K Line

14 CAN Low

15 ISO9141 L Line

16 Vehicle Battery +ve

* Long pins

These are the standard OVMS supplied pins:

4 Chassis Ground

5 Chassis Ground

6 CAN H (Primary)

14 CAN L (Primary)

16 +12V

So obviously the main difference is the lack of K / L lines in the OVMS ... but I wouldn't have thought that would have prevented it from powering up.

Does anybody have any thoughts on this?

//.ichael