1983 Chevy S-10 tachometer

There is usually four wires comming from the tach . One is ground one for lights at night two to connect to the distributor wire. Some tachs have 5 wires. Check with the manufacture to get a diagram and see what wires are connected to each thing. Don't install with out knowing what wire go where if youy hook up the wrong wires then the tach can short out.