How do you hook factory tach to pro comp distributor?

To hook a factory tachometer to a Pro Comp distributor, you'll typically connect the tach's signal wire to the negative terminal of the distributor's coil. Ensure the ignition is off while making connections to avoid any shorts. If your tachometer requires a power source, connect it to a suitable 12V source. Finally, double-check all connections for security and correct placement before starting the engine.