ok, let me ask you this first.
do you use the tremolo?
if not then a tune o matic may be ok for you BUT!
i want to warn you that the tune o matic is generally set at a radiu of 12
and the jag-stang's neck radius is 7.25
so you would need to file it correctly or deal with some bad action issues.
and......
it sits a bit higher than a normal mustang trem so.... you will need to either shave the bottom of the tune or matic or shim the neck a but.
or you can groove the saddles extra low to help compensate.
may i ask why you think you need a tune o matic?