91 to 90 oil cooler swap

[Halon]

OK so I've removed my 91 coolant style oil cooler/filter housing setup. I'm putting in a 1990 style one, with an external oil cooler. I have a question though.

On my 1991 one, there were to electrical connections. One of them was the connection for the stock oil pressure gauge. How on the 1990 housing, I do not see a spot to put that oil pressure gauge mechanism. In the area where it would normally go, it looks like there is some kind of pressure mechanism or something, but with no electrical connection. What do people typically do?

I'm sorry I don't have any pictures to further explain, but hopefully someone just knows what I'm talking about.