i had posted this this question in the technical section without any response, therefore being desperate for possible answers maybe it's a cigarette problem and not a 525efi issue.

my boat is a 2007 cigarette top gun with 525 efi. when I turn on the key the electric fuel pump pressurizes the system to about 40psi on the gauge then it holds at that pressure for only about 1 or 2 seconds then the gauges go to zero.(it used to hold the pressure while starting) when I start the engine the tach, oil pressure, water temp, and fuel pressure read zero. I have already changed the AGI box. the new AGI box seemed to work for about 3 seconds before it zeroed out the gauges. not sure if I just burnt out another box or if the problem is somewhere else. is there a scan tool that reads at AGI connector? any ideas would be appreciated. All the obvious grounds are tight and clean.

Did you ever figure out what your problem was?

yes. i purchased and installed a new AGI box from Livorsi and still didnt work. after changing key switches, starter buttons, and relays, someone suggested i try another AGI box on the other side to be sure it is good before i install it on the bad side and that worked. so long story short it was a new defective AGI box

Thanks for the reply. I have had that same problem also before. Glad you got it fixed. Happy boating.