Mechanical temp gauge question

I emailed the EQUUIS tech guy's about the temp gauge sender not fitting, and they got back to me with a detailed account of what I need to do.
Buy an electric gauge???? what I needed a tech to tell me that...what are these guy's based in India as well LOL.
So after buying the 2" trio set they what me to spend another $50 on the electric..hey maybe that one won't fit either.
AL