How are folks reading transmission temperatures in 2023? The tech in our trucks haven't changed, but we are all walking around with computers in our pockets.

The last time I needed to read my transmission temperature after a drain and fill, I used a friend's ScanGuage. Unfortunately I do not have access to it this time.

I think I should be able to use a jumper wire on the OBD2 port in conjunction with one of the lights on the dash to check the temperature, but I have never tried to do this yet.

I really don't want to buy a ScanGuage. I would rather buy some Bluetooth OBD2 scanner and use my phone to read and display. Btw, I am using an iPhone as opposed to an Android device.

Would like to hear your opinions on the following:

1) What method are you using? E.g., jumper (assuming that is valid method) or OBD 2 scanner.

2) How does the OBD2 scanner like a ScanGuage read the temperature? Does it reference a memory location to calculate it? If the ScanGuage can do it, then I assume any OBD2 scanner can do it assuming you can enter an advanced function to do so.

thanks!