6.5 trans temp gauge
 

where do i hook up the sensor for the trans temp gauge on my 1999 6.5 turbo diesel with a 4l80e trans?

many people weld a bung into the oil pan during a fluid change.

quicker and easier, and also commonly done is using the out line to the cooler. use a proper tee fiiting and you will get instant results. measuring the temp of the oil thats actually doing the work

Yup or you can rig something up into the drain Plug for it as well

quicker and easier, and also commonly done is using the out line to the cooler. use a proper tee fiiting and you will get instant results. measuring the temp of the oil thats actually doing the work[/QUOTE]

Which one is the out line?

Thanks

you can try using am infrared temperature gun and shoot it at both lines, whichever line is hotter is the one carrying fluid to the cooler. the cooler one would be the return

Isn't there a test plug on the side of the trans that the sensor will screw into?