The Wild Wild West mural is on the back side of Sunbeam Market at 14th and Adeline in Oak Center, which has another mural on it. This mural features Looney Toons characters like Wile E. Coyote and Yosemite Sam along with cartoon-y letters and "BOOM!" "POW!" written on it.
The mural is by Bank, Rekn and Kervz
Lots of pictures here.