It leaks tranny fluid because it is connected into the tranny. Have your new switch near you ready to go with some teflon tape on the threads ready to install the minute you take out the old one and you should have minimal leakage. There arent too many choices, fuses, wiring, harness, bulbs, neutral switch, that's it. One of those is bad. I replaced a neutral safety switch on a 1970 AMC and it was easier cause it was inside the passenger compartment on the steering column.