Have a '62 with a 6 cylinder. It has a temperature gauge that has lights only, no pointer. When it's cold, it lights green, when the engine warms up, no light, and when it is overheating lights red. Problem: both green and red come on sometimes. 1) Is there a wiring diagram for this ? 2) Where can I get a new sending unit (the unit has 2 wires going to it)?

Thanks is advance