I take apart two brand new cars a day at work. I work at a late model wrecking yard. Many of the cars are car-b-que's. After seeing many burnt cars I desided to put in a Holley low oil pressure fuel pump turn off switch. If the engine stopped so would the pump for safety. It was a great idea, but the thing was a pain. It was supposed to over-ride when you start the car. A wire from the starter solinoid jumps the pressure switch so you can start it. It worked but there was a nasty delay. So when you went to start it, it would crank forever before the fuel pump turned on. I was taking apart a 1999 Ford Escort the other day and it had an inertia switch in it. I installed it in the II this week-end. The switch could not be simpler. It is wired in-line and only has two wires on it. If the car gets hit or heavily disturbed the fuel pump will shut off. If the switch triggers by mistake it can be re-set by pressing a red button. The switch is very small and plastic. Sounds like it has a ball bearing in it?! Many newer Fords including Mustangs have the same switch if your combing the pick-a-part. Play safe