I have been testing and looking into radio and instrument read out issues which are usually a grounding related. FD has the ground wire start at the water pump, down to the center engine mount bolt, up to the starter solenoid and battery, over to the reg/rec, and up to a bolt on the firewall and into the instrument panel and connected to either a bolt with all the ground wires stacked or a grounding block attached to this bolt. This bolt loosening and sometimes the other grounding points looseni