How do you use timing light on 78 chevette 1.6L?

To use a timing light on a 1978 Chevette with a 1.6L engine, first ensure the engine is at operating temperature and the ignition is set to the desired timing specification. Connect the timing light's clamp to the number one spark plug wire and attach the power leads to the battery (positive to positive and negative to ground). Start the engine and aim the timing light at the crankshaft pulley or timing marks on the engine, observing the timing marks to check if the ignition timing aligns with the specified setting. Adjust the distributor if necessary to achieve the correct timing.