Once the distributor is installed and wired and the plug wires are installed, it’s time to set the timing. Remove the vacuum advance and cap off the hose so you don’t get a vacuum leak, and then adjust the timing as specified for your vehicle. Timing degrees are usually found on a decal in the engine bay. Loosen the distributor hold-down and turn it accordingly, then retighten. If you have any issues, double-check that your battery and charging system are up to spec because the DUI requires a healthy 12 volts.