From what I can see on the wiring diagram, there is one thing that ALL of these gauges have in common. It's a dark blue wire with a white stripe on it. It's the 12v in for all of those gauges. It also powers other misc. switches and lights for when you turn the key before starting like (neutral safety switch, parking brake indicator light, shift indicator, 4wd indicator light and anti-lock indicator light). It might be a good place to start. Check the condition of the wire and all of it's connections at the gauges.