Grats, welcome to the family!
The fuel gauge not working could be an issue with the ground for it. Open circuit is empty, no resistance is full but all resistances are relative to ground so if the ground strap is broken or has increased resistance it will keep the gauge from going to full -- and in bad enough cases, keep it from working at all.
The speedo may be a more difficult situation if the cable or the socket it mounts into on the speedo is out. Cable driven speedos have become the bane of my existence, I'll tell ye.
Thanks,
-Andrea