I have two issues cant seem to find answers. 1963 Ford 4000 4 cyl gas with SOS. 1. The tachometer is all over the place and when I increase to full throttle the needle goes to the 5 or 6 oclock position and does me no good as far as knowing what rpm Im running at. Is there a tach adjustment or is the tach generator need replaced? 2. No matter where Ive looked I cant find anything for an adjustment for the pto shaft. It turns when not engaged. It does not seem that theres enough power to turn the 3point mower, but it still turns all the time. Any suggestions would be appreciated. Thank you