Hello UK, your first pic shows that you need to remove all the glue? on the circuit board input and get someone to do a good solder job on those pins. I don`t know the layout of your gauges but from one of the incoming pins you should have 12 volts leading to the silver box attached to the board, and an average of 5 volts coming out. That is your voltage limiter- it takes 12 volts and drops it to 5 with the use of an internal bi-metal switch which when heated, bends and breaks contact, cools and makes contact creating an average of 5 volts to power your gauges.Your gauge terminals are the four screws to the right of the v/l and are probably(viewing the picture) from left to right ,5 volts in, a sending unit, 5 volts in,and a sending unit.The small cylinder bolted to the rear of the cluster is a radio noise suppressor which will tie into the circuit as well to reduce static in your radio.That`s a start ,I`ll leave the rest for the DART guys. Hope that helps explain a little of what you have there.