Just remove on_loc_moved entirely

code/modules/integrated_electronics/core/assemblies.dm

@@ -349,14 +349,6 @@
 		return TRUE
 	return FALSE
 
-/obj/item/device/electronic_assembly/on_loc_moved(oldloc)
-	for(var/obj/O in contents)
-		O.on_loc_moved(oldloc)
-
-/obj/item/device/electronic_assembly/Moved(var/oldloc)
-	for(var/obj/O in contents)
-		O.on_loc_moved(oldloc)
-
 /obj/item/device/electronic_assembly/proc/on_anchored()
 	for(var/obj/item/integrated_circuit/IC in contents)
 		IC.on_anchored()

code/modules/integrated_electronics/core/assemblies/clothing.dm

@@ -67,18 +67,6 @@
 	else
 		..()
 
-/obj/item/clothing/Moved(oldloc)
-	if(IC)
-		IC.on_loc_moved(oldloc)
-	else
-		..()
-
-/obj/item/clothing/on_loc_moved(oldloc)
-	if(IC)
-		IC.on_loc_moved(oldloc)
-	else
-		..()
-
 // Does most of the repeatative setup.
 /obj/item/clothing/proc/setup_integrated_circuit(new_type)
 	// Set up the internal circuit holder.

code/modules/integrated_electronics/subtypes/output.dm

@@ -414,8 +414,13 @@
 //	var/datum/beam/holo_beam = null // A visual effect, to make it easy to know where a hologram is coming from.
 	// It is commented out due to picking up the assembly killing the beam.
 
+/obj/item/integrated_circuit/output/holographic_projector/Initialize()
+	. = ..()
+	GLOB.moved_event.register(src, src, .proc/on_moved)
+
 /obj/item/integrated_circuit/output/holographic_projector/Destroy()
 	destroy_hologram()
+	GLOB.moved_event.unregister(src, src, .proc/on_moved)
 	return ..()
 
 /obj/item/integrated_circuit/output/holographic_projector/do_work()
@@ -506,7 +511,7 @@
 	if(hologram)
 		update_hologram()
 
-/obj/item/integrated_circuit/output/holographic_projector/on_loc_moved(atom/oldloc)
+/obj/item/integrated_circuit/output/holographic_projector/proc/on_moved()
 	if(hologram)
 		update_hologram_position()