9 must-have car gadgets that cost less than $50

The wrong tire pressure can cause your tires to wear out sooner and can also lead to a poor fuel economy. In a worse case scenario, it could even lead to a blown out tire. But a digital tire pressure gauge lets check to make sure your tires are always at the recommended PSI (pound per square inch) so that you can have a safe ride.

This Lantoo 150PSI digital gauge will only cost you $10.95 on Amazon, and it also doubles as a flashlight and seatbelt cutter.

This device is exactly what it sounds like. It can be used to cut seat belts and break car windows in the case you or someone else is trapped after an accident.

This Resqme seat belt cutter and window glass breaker goes on your keychain and can be purchased on Amazon for $10.95.

This is a simple car accessory, but it's incredibly useful.

The Drop Stop fits between your seat and the center console so that you never lose anything in that annoying crevice ever again.

You can purchase a set of two Drop Stop inserts for $19.99 on Amazon.

One of the best features in new cars these days is the blind spot alert function. The feature is basically just a light built into the sideview mirror that flashes when someone is in your blind spot.

However, if you have an older vehicle, you can get the same sort of function by just adding blind spot mirrors.

A two-pack of Ampper blind spot mirrors are available on Amazon for $7.90.

A GPS tracker connects with your smartphone to let you know the location of your vehicle at all times.

While this gadget is probably more useful for parents trying to keep tabs on their teens, it can also come in handy in the unfortunate event someone tries steals your vehicle.

The Spy Tec portable GPS tracker even allows you to set up a geo-fence and will notify you via email or text if the car goes outside the pre-determined area.

You can buy the Spy Tec portable GPS tracker on Amazon for $49.95. However, you'll also need to pay $25 a month for the tracking service.

A dead smartphone is the last thing you want while traveling. If you don't have a USB port in your car, or if you need more than one port, this Maxboost USB charger is a good option.

You can buy the Maxboost USB charger for $9.99 on Amazon.

You don't have to buy a new car to be able to connect your smartphone to your vehicle via Bluetooth.

Mpow's Bluetooth car kit plugs into your car so that you can play music and make calls over your car's speakers hands-free.

You can purchase the gadget for $17.49 on Amazon.

A smartphone mount can make navigation a lot less stressful.

Instead of constantly looking down at your phone for directions, you can use a mount to keep your Google Maps or Apple Maps app within your line of vision.

The iOttie smartphone holder is the best-selling mount on Amazon and costs $24.95.

Before you can drive anywhere, you'll need to find your car keys.

Keeping a Tile Mate Bluetooth tracker on your keychain can help ensure you always know where your car keys are located. You simply attach the Tile to your keychain, and whenever you can't find your keys, you can use the Tile app to make your keys ring.

The app also tracks the last place it paired with your smartphone, so if you leave your keys somewhere outside your home, you'll be able to see where you left them.

You can purchase the Tile tracker on Amazon for $24.99.