Hi Robert,
I had one of our experts take a look at your question. In the current version of Pulse, we have only one way to share widgets/dashboard with other users - by using the default dashboard.
First, the Administrator should create the dashboard with the required widgets and then set it as default (press vertical ellipsis (column of three dots) to right from dashboard's name and choose 'Set as Default Dashboard' from the drop-down menu).
In order to let supervisors to see only this default dashboard, and not be able to create new or edit existing widget/dashboard you should perform the following steps:
1) Create new (or modify existing) role for supervisors: provide only 'Pulse View Dashboard' privilege in the Pulse section.
2) In user's own Person object and user's own Tenant please set only Read and Execute permissions.
As a result, after login, supervisor will be able to view only the default dashboard. If Administrator changes the default dashboard, the supervisor would see the altered view after logging back in.
Please note, that only one default dashboard is allowed per tenant.
Thanks,
Neil