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I have a 1977 F150 6cylinder. The plastic part behind dash cluster is pretty much gone. None of my lights work although once I a while I catch a faint glimpse of a signal blinking. Obviously I need that part and others have posted to me before concerning thst issue. What I want to know is if this part is also related to the speedometer and odometer not working as well. Also my fuel and temperature gauges work intermittently...sometimes way past the far right line and sometimes fairly accurate in unison. Anyone have any ideas or suggestions if all these are related the plastic cluster backing or something like a voltage regulator. I know thst part is available for around $75.00. Thanks.