1984 325e, 2.7 I6. I have a cobbed together assortment of fittings & reinforced hose that I am going to use to test the delivered oil pressure on my car. Should the lashup start to leak while testing, and I am under the hood watching the gage and working the throttle by hand, I would like to kill the engine quickly...without running around to the driver side and getting in to operate the key. Is it possible to simply jerk the central coil wire out (certainly killing the engine) without causing problems for the Motronic ecu? (I've heard that doing the convenitonal "power balance" by pulling one plug lead at a time and noting rpm drop is very apt to cause damage to the Motronic, so I wonder if hyankign the coil HT lead woudl do similar...or if it is OK. Or is there a wires and push button lashup I could make that would slip into the diagnostic connector to kill the engine cleanly?