Any body got any other ideas for attaching a seperate ground to a 1-wire O2 sensor? I don't want to trust the rusting exhaust system and its connections. The only permanent connection I can think of is to solder a lead to the outer housing, but I am afraid that even the upper edges get too hot, and will remelt the solder. Can a lead be welded on? How much heat is too much? I can braze a connection in place, if that won't destroy my shiny new sensor.

  And that raises another question. On a newer-style, self-heated O2 sensor, is the ground only for the heating element, or does the sensor also use that same ground?
  In other words, does the sensor ground through the housing and then the exhaust system, or does it also use the ground for the heater?