Its on the intake runner for the #1 cilinder(all the way to the rite looking at the front of the car) You should see two wires bolted fairly close to each other on the runner. Either of those two spots will work.
Well im tring to find the article on www.se-r.net right now but it appears to be down so no luck. But its on there think under maitience section maybe. But its where you test the current grounding voltage of your MAF and if its below a certain voltage you should reground it. Regrounding it you take a wire and attach it to the ground wire on the MAF plug and then run it to one of the block ground bolts. The most common and closest one is on the 1st cylinder's intake runner. Real easy to see if you have a high port(91-93) engine. Its on the curve of the runner on the side its really close to the fire wall like couple inches close. It will be black and have a couple wires already going it usualy