This afternoon I checked the wiring to my left wing and found that I had connected the strobe wires to the wing lights and visa versa, swapped them over and re-tested, and all working properly now.
Also changed the pulse count on the tacho to 0.5 from 1 in the skyview, so this should solve the problem with the rpm reading double the actual value.
The setting is under SETUP MENU > EMS SETUP > ENGINE INFORMATION.
Many thanks to Russ Dent who posted this info in answer to my question on the Dynon discussion forum.