lear4406

I believe the negative side of the coil is correct. On the oil pressure guage all you need to do is hook up the oil light wire off the old guage to the new guage and then install the larger barrel sending unit and hook up the old wire directly to it. Hook it just like the oil light sending unit you are replacing. I believe you can order the factory guage sending unit from NAPA or Auto Zone. Hope this helps.