1968 Dart ... Need wiring help

I just installed a Master Power vacuum pump yesterday 11/29/2017 and now my headlights are flickering. I am guessing that I am not putting out enough power from the alternator. I just seen an old Hot Rod magazine article that showed how to install a higher output alternator without running the power back through the bulk head connection using a kit from MOPAR BY CRANE Electrical Upgrade Kit (Harness Preserver) but when I searched for the information I see that they (MOPARS by Crane), have closed a while ago. Does anyone know of another manufacturer that is making this same kit or is there a better way to do this with out installing a whole new wiring harness, (I am retired and a upgraded wiring harness is to expensive for me right now).