I think you may stand a bettter chance of getting help here by letting
everyone know what year/engine/car!

Functionally, I guess you could say sending units [electrical] are
universal.  Essentially, they are an electrically-read unit that
creates resistance within the unit as a function of temperature.

As to applicability, that's more about the size of the sensor, thread
size/diameter, generally it's physical size.  While not the same
vehicle, I did what you are thinking of with a Jeep Cherokee straight
six.  I got a T fitting, installed that into where the temp. sensor
was.  I then put the temp. sensor in one end, and a mechanical water
temp. guage tube in the other.  The main hassles I had were in buying
adapters to mount the mech. [aftermarket] guage tube onto the
T-fitting.  I used a T-shaped fitting, but you may need to use an
L-shaped fitting in addition [mounted on the T-fitting at one end], in
order th get clearance around the mounting area for one or the other or
both sensors or tube/sensor.  It can be a lot of plumbing and use of
adapters.

The one thing I found out was my electrical unit read about 10 degrees
lower than actual, and the mech.guage was spot on, after the project
was complete [and, man, it was a project, LOL].  Because the elect.
guage read lower, the cooling fan was delayed in coming on, which I
didn't like.  That's one more thing to consider.