Started up my jeep after it sat idle for 2 weeks. After i drove it home i noticed that the check engine light came on. Took it to get the codes read and got:

P0463
Fuel Level Sensor A Circuit high Input = Fuel Level Sending Unit Volts too high?

P0720
Output Speed Sensor Circuit malfunction = Low Output Speed sensor RPM above 15 mph.

Anyone have any insight on these 2? And if i had to fix it myself how difficult / cost?

I have a 98 Jeep Grand Cherokee Laredo L6

Thanks