Use the factory starter lead. Hook the old engine coil lead to the wire harness power feed. If it has a voltage drop resistor or fusible link it will need to be removed. Connect the old alternator light lead to the small lead coming out of the alternator. Run the old alternator lead to the new alternator. Does your truck have an electronic oil pressure guage? I had an old 1998 broken O/P unit so I tapped it to fit the OBS sensor and installed it in the factory location since my 2002 F-body PCM doesn't care if I have O/P or not. You also can tap the little fixture bolted on the oil pan next to the oil filter. For water temp readings use the three lead water temp sensor from the 1998 F-body. One word of caution when filling the radiator with water, leave the air bleed line off on the engine while filling until you start to get a steady stream of water running from it. If you fail to do this you may end up over-heating.