Thanks to diggatron and Rallytuned.
#3 at the bottom left of the coolant flange the saturn sensor fits.
2006 Saturn Ion Redline 2.0l 16v.
Dont buy from the dealer unless you have DEEP pockets. 8-12$ on rockauto.com
OR this sensor with an adapter:
Saturn Ion, they have a 1/8" NPT CLT sensor with the standard GM connection ($12 to $16). Note: the pictures below depict a saturn SW1 sensor.....same thing, different connector......it was for testing after all..........
What was used to "adapt" it to the cylinder head was a 1/8" to 1/4" NPT adapter bushing found in the plumbing section of Home Depot! ($1.90)
AC DELCO Part # 213953
ACDelco Part # PT172 for pigtail