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If Im not mistaken (I couldbe cause Im going from memory here) - there is a pressure service port on the C6, Drivers Side, Jsut forward of the gear selector. Normally has a plug in it. It's ment to read the overall operating pressure inside the tranny (which can be up to 300 psi).
Ive got my temp sensor and a presure sensor in a T-block plumbed into the cooler line as it exits the tranny. Wokss well there also, but the pressure's not as high on mine (about 100 psi when the coverter is stalled, 30-70 rest of time depending on the load).