Hi,
First, you need to check which "tax category" is configured in your products.
Then, go in System>Taxes and click on the "manage tax rates" button. There, click on the "new" button and create a new tax rate with the name "sales tax" and the value 8.375%
Then, go back to System>Taxes and click on the "new" button. There create a tax rule with the tax category of your products and that new tax rate and in the zone setting select the Nevada state zone.
Make sure this tax rule is enabled and that you don't have other tax rules enabled.
Then, disable the TaxCloud plugin and it should work like you want.