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C6 should already have a temp sensor in the trans as shown below, you can log it via hptuners or you can get dashlogic which lets you pick a number of things to display on the dash.
Its easy to drill that factory location, use a 1/2 inch right angle drill. Then run a standard NPT tap in the hole,, NPT taps run in easy due to the taper and they like to go in straight without a lot of fuss. Aluminum drills easy just go slow and take your time.
Pro tip, when close to breaking thru the boss, dip the drill in grease and cut a few rotations then clean the bit and dip in grease again to catch all of the shavings. Also, tap the threads before you break all the way thru the boss and finish drilling with a slightly smaller bit. The thermocouple on the sensor is smaller than the NPT threads.
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Adding Temperature Sensor to TR6060 
