Custom dashboards are created by users of the current instance of vRealize Log Insight. Custom dashboards are organized in two categories, My Dashboards and Shared Dashboards. Shared dashboards are visible to all users of the vRealize Log Insight instance.
I am not sure if this is going to work but a possible workaround: Export your dashboard. If it is a personal dashboard go to content packs menu and then go to My Content based on where your dashboard is, select gear icon on the right and select export.
Provide the exported vlcp file to your selected users for import. Once imported they should see it under my dashboard.
Yeah I think that will also work.
If you could upgrade to 8.x there is a whole new sharing feature you could use as well.