There is a lot that can be done to revive the old guy. The main upgrade would be the controller. Bang for the buck would be an Ortech controller. However, this will still be an old grill. A more expensive
controller would improve heat control to a point. In the end, it remains an old grill lacking many of the modern gadgetry.
What about the reliability of the rest of the pit ?? Auger motor, metal parts - body, heat shield, cooking grate. Dents, rust, warpage and paint. Wood handle.
Decision time is on the horizon.