The coolant temperature sending unit indicates the engine temperature to the temperature gauge.
The coolant temperature gauge sending unit on your Mustang is an important part of knowing what is going on in your engine bay. If yours is out, you are playing a dangerous guessing game! Don't risk your engine on such an inexpensive part. Replace it right with this quality piece from Motorcraft and rest easy knowing that your engine isn't overheating!
As a deployed service member, there are not many avenues of contacting companies back home conveniently. Between the time difference and use of wifi or morale phones, it can be challenging. Luckily the team at LateModel Restoration emailed me back quickly and gave me everything that I needed for a smoothe purchase, and a few more that followed. They were quick in reply and quick to help me out and I have my parts on the way to my home now because of it. I will be shopping here primarily and I recommend it highly to fellow Mustang folks.