94 Prelude digital fuel gauge and clock

Hi , i just got a 1994 Honda Prelude SI,no owners manual,now my fuel gauge won't lite up after start the car,it does it from time to time for a few seconds,then it shows only one bar,also the digital clock can't be reset,i did push the little nob and turn it from left to right and nothing happens,can some one know how to fix this two preoblems?