Mazda 3 - how to connect to HS CAN bus

Hi, I would like to connect my CAN Bus Triple to both HS (High Speed) and MS (Medium Speed) buses on my Mazda 3 (2007).
I can hook to MS CAN bus through stereo or LCD harness, I know they both have the CAN pins for that bus.
Now I'm searching for a convenient location to connect to HS bus.
Obviously I could use the standard OBD2/J1962 external diagnostic connector, but I dont't want to expose wirings so I prefer to use an internal cable.

Can anyone suggest me how can I hook to HS bus?
Thank you

HS Bus should have some wires going to the instrument cluster

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