Try to load oil pressure gauge into an omega d4 using Pi toolset and the fault command. The problem is that now the dash is restarted constantly so it does not allow me to establish a connection again.

Attached two images try to show him the problem, constantly go from one state to another, shows information and then no, it is as if constantly reset.
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First thing to do would be to disconnect all sensors to the D4 and then try to connect.   The sensor could be making some issues as this is something that you just added. But disconnect ALL sensors and any switched inputs, CANbus etc etc  Double check all earth points and voltage supply.  If possible connect on a bench rather than in the car.   If you still have problems post again..  
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