Can these be wired to the switch to actually indicate the direction of the turnout?

Name: Bachmann Three-Color Lighted Block Signal -- 12 - 16V pkg(1) - HO
Brand: Bachmann
SKU: 160-39115
Price: 21.83 USD
Availability: InStock

These can be wired as any other signal. Your switch machine would need to have the appropriate outputs to properly drive the lights as desired.

Bachmann - Three-Color Lighted Block Signal -- 12 - 16V pkg(1) - HO

Item Number: 160-39115

MSRP: ~~$39.00~~

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Your Price: $21.83

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Scale: HO

12-16V AC or DC power source needed for operation.

Additional Product Information

Manufacturer/Brand: Bachmann
Mfg Part #: 39115
Choking Hazard - May contain small parts. Not for children under 3 yrs.
Model railroad items are not intended for unsupervised children under 14 years of age.
UPC: 022899391151