couple interior questions

[CyFi6]

Hey i recently got an 87 na. The clock almost never works. Itl show a time but itl never be correct, even after ive set it. Half the time when i press the buttons to set the clock itl either go dim and do nothing, or just do nothing. Sometimes itl dim with headlights on and sometimes itl just stay bright. Every now and then i can get the buttons to actually change the time, but next time i check the clock its totally off. Im wondering if anyone ese has had this problem, when i smack it hard it seems to start working differently, usually not properly though.

Another question i had is what power source do you guys use for your interior acessories such as gauges, amps, subs, all that kind of stuff. I had to run a 12v wire from the battery for a sub and i soon found there NO holes in the firewall for wires. I ended up running it through the throttle cable hole but i am kind of nervous as theres not even a gromet. What do you guys do about this kind of thing?
Thanks a lot!
Cy