I'm not from the area, so probably not the best person to provide an answer, but I'll offer what little knowledge I have.
TAC channels are designed to be used on-scene, so typically need extremely little coverage area. As a result, they generally do not use repeaters. You will need to be close to receive the traffic.
Having said that, according to the FCC, the license for what is in the database for a VHF TAC channel, WPLW620, is expired.
I'm assuming you are monitoring 159.165 for dispatch, and 154.265 for secondary. Under the expired license there is another frequency pair that may be worth monitoring: 154.815 and 158.985. It wouldn't be out of the realm of possibility for them to be using the old input frequency as a TAC channel. Stranger things have happened.
There is also a UHF frequency coordinated for use by 245 portables under the license for the primary dispatch frequency, WPKN711. While it's probably used for paging, it's worth plugging in 465.600.
As I said earlier, it may not be any help, but . . . at least it's an answer.
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