Lee,
On my boat I recently lost all power to my instruments (my fault) and found an in line fuse behind the control panel that was in the wire to the NAV rocker switch. Hope yours is that easy.

There is a breaker on the panel that you should check and make sure it hasn't popped. Also a breaker down on the engine at the rear were the fuel pump is, big red button on our boat. Don't have the engine manuals at home with me right now so can't check any further, memory doesn't recall anything else.
Switch could be bad, did you check for power at the ignition switch in the panel?

Lee, if you're talking about the engine instrument cluster on the Mk II, located on the binnacle immediately in front of the lower part of the steering wheel, then here is what I learned recently. Power to all engine instruments passes through a circuit breaker located on the bottom of the pod. Even so, it is still possible to start the engine. Located beside it is an On/Off switch for the blower motor (motor located in the port lazarette).

In troubleshooting my problem, I found that I had a short somewhere that was popping that CB. Once in the pod with a voltmeter, I found that my vent blower motor wire was shorting the voltage to ground. I dug down in the port lazarette, cut the poewr wire to the blower, and confirmed the short. WM had a suitable 3" blower motor, and 15 minutes work for the change-out fixed the problem.

Presumably 9 years of operation wore the brushes to the point where they failed, and the motor froze.