What he said... this is the way to go!

"Find the little alternative oil port plug that is located inside the passenger motor mount. Assuming it's a 22R motor. Because the 22R has two alternative places to bolt motor mounts, they had to include an alternative oil pressure port. It currently has a screw in plug. Unscrew that plug. Your stock idiot light will just fit inside the motor mount, because it's fairly small. Then mount the stock wire to the stock idiot light sensor."

'87 22RE