As the title says I need help setting up ILS approaches on fighter jets f15 f18
In the F18 wiki tutorial https://www.aerofly.com/dokuwiki/doku.php/aircraft:f18 we explain how to do this for the F18.
The F15 doesn't have the up front control (UFC) yet, so it's not possible to tune the frequency from within the cockpit if I remember correctly. But you can use the control assignments for the nav frequencies to tune the station and course.
And in the Aermacchi set the frequency in both cockpits or you will not get the (hard to read) DME.