Just thought it was worth sharing this experience. Been on Aquila last few days doing maintenance. I switch on the circuit breaker for the engine battery to double check the battery charge and after a few seconds heard the sound of 'ready to start alarm' on the EVC located at the helm. This of course should not be possible unless you push the ignition button on at the helm. When I went to the helm the fuel gauge was flicking between empty and fuel and the on/off ignition button failed to work on most occasions. All a bit odd.
I made enquiries with Volvo Penta and learnt the the EVC is feed by the IMD (ignition multi Diesel I think) which is located on the port side of the engine and consist of the intelligent part of the electric feed to the EVC. The IMD is the more expensive, circa £400 where as the EVC is £125. The IMD has a small fuse in the top which I was also able to check.
Fortunately for me I was able to get a new EVC and test that unit first of all. Simple plug and play, and thankfully it worked. The new EVC also has alarm/ dimmer to reduce brightness of techo etc.
My boat is the new designed Farr design, Cruiser 36 Avantgard 2012 so not sure why the unit just failed but it has, according to VP the unit is a simple basic unit and seldom fails.
Just tight it was worth sharing with the forum.