[diesel_john]

two opposed because they cancel horizontal "vibration" but retain the expansive signals. wire parallel for this effect. i noted there were two in the store bought example. GM because there is an endless supply. don't squash the line, hand tight. difficult to wire in series anyway, base is one wire and connector is a single pin. tools to harvest sensors 7/8" 6 pt. deep socket (they are very tight), wire cutter and a bucket.