Toad Intelligence Central server has not been tested alongside Tableau on the same machine. However no compatibility issues would be anticipated provided the ports do not clash. Toad Intelligence Central uses ports, 3566, 2166 and 8066 by default. These can be configured at the time of installation.
What should also be taken into consideration is the likelihood of the load the machine will come under when hosting both Toad Intelligence Central and Tableau. More information regarding appropriate hardware, based on usage, can be found in the System Requirements section of the Toad Intelligence Central
Release Notes.