1973 Duster - Fuel and Temp Gauge issue

Many thanks for all the advice! Fitted a new Voltage Regulator at the weekend. Cleaned the white connector block and the connector blocks at the back of the engine bay as well. Then discovered that the earth lead from the battery to the radiator support was broken, so repaired that & fitted an extra earth lead from the engine to the body. Going to do some more & re-test next weekend but think it's just about there. Fingers crossed!