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I'm trying to work out if the garage installed a required optional wire to enable a tyre pressure reading in the FIS.

You need to run a wire between the FIS unit and OBD socket pin 15 to enable the reading. I'd guess they didn't.
I'm hoping to read the live bar reading by corner.

This morning I ran the OBDEleven to see if I could view the data there. It can't get a response from the Control Unit.

Is this as expected or do I have an issue?
Do you think I'll be able to get the corner specific bar data?

I'm trying to work out if it's worth pulling the cluster to get to the FIS unit and add the wire if they did not.

I’m not sure that the TPMS is on the L line.

Can’t you connect with the Vagcom? Has it been coded out?

Have you tested your system to see if it works? Let a tyre down to test.