I had the same thing happen but it busted loose under the hood. Sprayed the oil out in a mist and it caught fire. Obviously stopped when I shut down the motor but I will never run a mechanical gauge again. I know they are more accurate but IMO an electric one is close enough.Many years ago friend of mine had the oil line pop loose on a mechanical gauge which sprayed hot oil on his legs (and polyester pants). To this day when he wears shorts you can see the big splotchy birthmark-like purple scars all over his legs. Never minding his particular hows and whys that pretty much put me off running a mechanical oil gauge. Ever.