I bought an oil pan conversion kit for a 351 that I'm putting into a 90-93 5.0 - I haven't bought the car yet - re-building the motor 1st....I finally pulled the pan out and there is a screw in type hole that's on the side - now I assume its for either a oil temp/press gauge or a dry slump can for the oil - or?....any help/direction would be great!...thanks!