ok...actually what is on your car is called a B.A.P. sensor. It looks just like what most people refer to as a M.A.P. sensor. The BAP which your 92 came with, reads the barometric air pressure therefore it DOES NOT have a vacuum line connected to it. Older Fords (typically speed density) use a Manifold absolute pressure sensor (MAP), it reads manifold pressure. This is why it would it would need a vacuum source.