The wiring could be loose at a connection that feed the dash cluster. The fuse box could also have a loose connection.
One of the most common problems on the first-generation 300ZXs is the digital dash power supply unit. The part is like an electronic module, located under the dash on the driver's side. The internal cold solder joints wear out, leading to failure of the power supply, and therefore no digital dash lights. It is quite possible to re-solder those joints yourself and get it working again. Another option is to search the web. Look up 300ZX digital dash power supply, and you'll find people selling them reconditioned. Others offer the service of refurbishing your old unit if you send it in. If the power supply isn't the problem, then it could be the digital cluster itself. But more than likely, it's the power supply unit.
I have the same problem..dash lights were intermittent for about a month and now no dash lights at all. My guess is the light switch but I havent checked it yet.
Chevy Caprice had the digital dash installed from 1994 and up, but if you have an older model you can still get the digital dash.
It is probably a bad ground most intermittent problems with electric components are
The most likely cause of 'dark' and 'intermittent' responses from a digital display is when the individual bulbs at the back are making bad electrical connection with the ribbon-loom
by using some of the converters we can swap the analog dash into digital
Where is the fuse for the digital cluster dash in a 1992 Chevy S10?
What is wrong with your dash?
it is intermittent
... what about it..?
check your fuses. it is most likely the fuse that goes to your electronic digital dash.