Nope... I had one in my 2007 Expedition that is now in my 2015 F250. It picks up the temp from a sensor in the pan area (at least on my Expedition). The OBD monitors the Temps and that is where it reads the info from as you plug it into your OBD port. You will have to enter the X Gage codes which you get from their website, easy to do.
My F250 has a Trans Temp digital gauge but is buried in menus, the Scangauge reads the same temp. On my Expedition I had it set to read Water Temp, Trans Slip, Trans Temp and Instant Mpg. When towing it was nice to be able to monitor the Trans info, the Slip was whether the Tourque Convertor was locked up or not.
On my F250 I have not found the right code for the Trans Slip so have it set for Water Temp, Trans Temp, Alt Volts and Instant Mpg.
Been meaning to call Scangauge about the Slip code, I had to call them before as well as when I got it the connector cord was damaged and they sent me a new one, no charge, so they are very helpful if you have any questions on codes.
'16 28BHBE / Elite / Thermal / Dual AC / 50 Amp / 12K Equalizer
'15 F250 Lariat CC FX4 6.2 w/ 3.73 / Air Lift 5000's / ARE Z Cap
'12 X19H Hybrid (Sold)