Radio and gauges not working
 

I just purchased a 1990 K5 Blazer that i am going to restore. I noticed that my oil pressure, Temperature and Alternator gauges as well as my radio does not work.
The radio shows the time but does not turn on and my gas and speed gauges both work properly. I checked all fuses under the dash and they are all good. What else can I check? Are the gauges fuse driven or are they purely analog is a thin-net cable?