not familiar with the engine, but oil pressure switches go bad regularly. Usually they just start to leak oil, but sometimes the contacts do go bad and they just ground out. I would remove the old one and take it to a auto parts store and look for a replacement. Chances are that they won't have the correct one for your application, but any working one is better than none at all. Then you will have time to purchase the correct one from a Ford dealer, unless the Ford dealer is local to you and you can purchase one immediately. Screw the new one in hand tight and use Permatex on the threads. DON'T use Teflon tape!!!! After it is hand tight, give it another 1/2 to 1 full turn till tight. Start and look for leaks. If none, fine. If it leaks, give it another 1/8 - 1/4 turn. The threads are most likely 1/4" NPT (National Pipe Thread) unless it is a European or Asian block. Then, I don't know what the thread is. A new switch can be as inexpensive as $3.00 and no more than $10. The $10 one is usually gold plated and comes with installation.. /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif There is a special socket for these switches, but you can usually remove them with a large slip joint plier. Just don't squeeze so hard that you damage it...