I am installing an Isspro trans temp gauge an would like to know the best route to run the sender wire. I will be putting it in the trans hot line to the cooler. Most everything I have run is through the firewall grommet to the upper right of the steering column, but is there a more direct path near the trans tunnel? Also I will be splicing the cooler "hot" line with the "T" from Diesel Manor. Is the line full of fluid that I should be prepared to catch when I disconnect it? I am hoping that it will have drained and I can just break it loose with minimal spillage. Thanks in advance!

I ran mine up along the trans dipstick and then under the weather seal along the firewall so it is out of sight. Then I ran it through the firewall into the driver side cab with the rest of my wires. Its a few extra feet of wire but not a big deal IMO

I ran mine all most the same route as Diesl4life but not up the trans dipstick tube. I used a tube cutter on the out line where it goes vertical at the right rear of the block. You'll get some fluid drain out but not a lot.

Perfect. That's how I shall run it too. I'm going to try and tackle it this week. Thanks guys!