Help! no gages

[willtravel]

I dumped one of the battery's and moved the other to the bed. Grounded the battery to the frame under the bed and ran a 2 gage up to the engine. I figured this would be enough. The truck starts no problem but none of the gages work.. What did I miss?

 

[willtravel]

I read in another post about how to check for dash fault codes. Its saying 920,921,940,950,999. Anybody got any idea what these mean?