The PAS Dashboard calculations service (pasCalculator.exe) is used for calculations required for each widget. The PAS Dashboard uses Windows authentication for whoever is logged in and displaying a view. Use a domain account with access to Integrity and the PSI server, as needed, for the calculations service (pasCalculator.exe) account. If you are using a multiple database Integrity deployment, this domain account could be the same account you specify for the pasIntegrityDB and IntegrityDataCollector2 services.
Make sure the calculations service is running and set to automatically start using the domain service account.
By default, the PAS Dashboard calculations service (pasCalculator.exe) runs under the SYSTEM account. Modify the calculations service properties so that it runs under the domain account you defined. Navigate to Control Panel > Administration Tools > Services and set the Log On for the calculations service to the domain account you defined.