Thanks for all the answers guys.
I changed the battery to a Varta Silver Dynamic 74Ah 750A. The voltage it's 12.7 - 12.8 now, the alternator charging at 14.4 - 14.5. The car starts much better now.
After that, the gauges works intermittent - >
VIDEO
The problem it's the NEC marked with blue in this
PHOTO?
If this is, isn't easier to take out the NEC from my spare DDE4 and put it on my main one? Like this I can still have the car original ECU.
I've did that before on a navigation system (android aftermarket) and it worked.