Using this Duramax PMD extension cable is easy. First, locate the Stanadyne 'Grey' PMD on your 1994 - 2000 GMC/Chevrolet with a 6.5L Duramax engine. Then, carefully connect the cable to the PMD. Make sure the connection is secure to avoid any issues. As for maintenance, it's a good idea to check the cable regularly for any signs of wear or damage. If you notice any fraying or loose connections, replace the cable right away. And always remember, this cable only fits Stanadyne 'Grey' PMD's, so don't try to use it with other types.