It should come with the light harness(mine did)but you might want to get the engine side and dash side harnesses from Year one,if your car did not come with a tach there is a small rubber plug in the fire wall they ran the factory wire thru,the harness will come with a rubber grommet and use a vari bit to enlarge the hole until the grommet fits.Dash side harness comes with factory connectors,FSM shows where to connect everything.