s2konroids

All standalone ecu's do away with obd2 as they have their own system to some extent so Obd devices won't work.

Personally I'd use an android device and £10 Obd Bluetooth device you'll get a bit more functionality too.

Santenay

I've seen one on this forum mounted in the sunshade. They used a passenger sunshade from a LHD car, removed by mirror and mounted the scan gauge in its place. It looked quite good.

E4RTH WORM JIM

I've got one I'd sell. Brand new really as it only been used a couple of times.

PM me if you're interested.

NineBolts

Scan Guage - Radio Door mounted.

I got this quite a few years ago now, changed the first one for a later model of firmware that has support for AFR. Mine displays Air Temp, Water temp, AFR then something else like Loop/RPM/speed

Takes a fair bit of butchery to cut out the back and reduce the thickness of the front layer but can be done with a dremel. I still have the OEM radio but will be swapping that one day, I will have to avoid anything too bulky or with a large centre mounted knob.