All the gauges went out in my car how do I find out why

Start by checking the fuses. You can also scan the computer for trouble codes related to the cluster or communication issues. If you don't normally work on automotive electrical systems it's best to bring this to a shop. There aren't specific diagnosis instructions for a problem like this. A hands-on inspection is best.Use this link to find a good shop near you. https://repairpal.com/repair-shops Alex