proper way to sudo over ssh

Question

I have a script which runs another script via SSH on a remote server using sudo. However, when I type the password, it shows up on the terminal. (Otherwise it works fine)

Answer 1

I faced a problem,

user1@server1$ ssh -q user1@server2 sudo -u user2 rm -f /some/file/location.txt

Output:
sudo: no tty present and no askpass program specified

Then I tried with

#1
vim /etc/sudoers
Defaults:user1    !requiretty

didn't work

#2
user1   ALL=(user2)         NOPASSWD: ALL

that worked properly!