Well, realistic or not, this wonderful bird does have ILS, just like a C-172. Carriers "have" an ILS and TACAN, but it's actually an integral part of the HUD, not actually broadcast by the boat. Having said that, it works as though it were coming from the boat.
Do you set the ILS freq for the particular airport or carrier on the UFC? Each carrier has their own ILS freq and TCN channel (IE frequency). For example, Javier's Nimitz v2, that most use and like, is TCN 57X (112.00). The ILS freq is the same, but still must be input to the UFC separately. IE: you select TCN on the buttons along the bottom of the UFC, punch in 112.00, and hit enter (or 5-7 ONLY for TCN 57X), then go to the ILS selection button, enter 112.00 agin. Then, on the right hand MFD, HSI display, box TCN or ILS, as required.
Do you turn the system "ON" with the button on the bottom row of the UFC, where you select ILS, TACAN, COMS, etc, right under the number pad? Far right-hand button.
Do you then go to an MFD, and box the ILS selection on the HSI display? On the upper left side of the HSI display? Third softbuttn down, from the top, of the left vertical side of the HSI display. Not any MFD. I think you need to use the Right DDI to display the HSI, and box the ILS or TACAN to have the HUD display them, as selected.
Again, you must be within certain distances/angles relative to the airport/carrier before the needles go active. The TACAN is a hemispherical, 90 nmi (roughly), guide to the airport or carrier.
One final note, if I may: do you hit SHFT-2 to call up the HUD Control Unit, and ensure the CAGED button is NOT lit? If it is, press it to de-select it (Not lit). If the HUD is in caged mode, yes, the ILS needles will be frozen in the center of the HUD.
Good fortune!
Pat☺