First of all there were actually two
different 4000s built in 1965. The last of
the old 4 cylinder 4000s and then in April
of 65 the new 3 cylinder 4000s were
introduced and that series was produced
untill the end of 1975. They are Very
different tractors. So generally we
suggest you tell us if you have the 4 or 3
cyl model.
That said, the temp sender on the 3 cyl
Fords is electric. It is located in the
very front (Front - not top or side) of
the head behind the fan.. There is a small
brass plug there that should have a male
spade clip for a wire to hook to.
Frequently, that spade clip is broken off
so you will likely need to buy a new one.
Welcome to Yesterdays Tractors by the way.
There is a very good Ford Forum here on
this site. In the future I would ask your
Ford questions there.
nnalert the Ford Forum