73 roadrunner tach

[MoparPat1]

Hello all, I have a 73 roadrunner which has a built in tach and is reading higher than it should, would the tach be bad or is there someting I can do to adjust it. Also the alternator is overcharing, I put a new voltage reg and switched alt but still over charging, any help.....

 

[bigjimmyl]

How high is overcharging? 13.5 14 volts or 19 or 20 13 14 is ok otherwise check the battery and charging cables for a short. is the reg adjustable? if not try and get an adjustable one but thew alternator could be bad also. these probaly wouldnt affect the tach but the are notorius for going bad it may be time for a rebuild had min e done and it works perfect