1998 Ford F-150 No Dash Gauges

So I bought this truck real cheap as a project of sorts and it had been sitting for 2 years without being run at all. I did simple stuff to get it road worthy but the only real problem I have now is that all the lights work in the cab and on the dash but the gauges themselves do not work. Not a single one moves when the truck is started up. I was told that for this truck, the mechanical signal for all the gauges and odometer go through a circuit card and then to the actual gauges and that is the problem. How do I get to this circuit card and is this true? As of right now, I'm using my GPS unit as my speedometer and odometer but its really irritating not being able to look at the dash and see the status of the truck.