I don't know anything about testing them, but the one on the driver's side isn't very hard to install. I removed and then re-installed mine a couple of times while I was working on the cruise control.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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