Thanks for all the input on the three wire O2 sensor.  I feel better about it
now.  I wasn't trying to cast doubt on the quality of other folks products,
etc, just wanted to know if the splicing was a good idea or not.  So it
sounds like it is when properly soldered.  I have  a good plug setup from a
Vanagon oxygen sensor so I might sell the universal one to customers that
feel confident in thier soldering skills and sell a pre-soldered version
(slightly more expensive) for those whose skills do not include soldering.
Thanks for all the info.  Hey if you don't ask you'll never know.
Ken Wilford
Van-Again
John 3:16