Talbert

Cluster is no longer coming on,fuel gauge is no longer working and the idle is unstable.I once had the alternator problem and dealer put a cheap regulator so when it happens a few days ago I decided to buy a new Valeo alternator.the voltage I'm getting on the battery is 14.1.Can anyone help me out please

Can you please help me out my cluster fuel gauge and unstable idle after changing the alternator.