Defi gauges help!

[Snakes]

I have a Defi oil pressure gauge hooked to a Defi control Unit. The oil pressure warning is set at 20psi. After an extended highway trip the oil pressure drops to 20psi at idle which caused the warning light and buzzer to come on. I followed the Defi instructions to lower the warning to around 18psi. But once the car is shutoff and turned back on the warning goes back to 20psi. I have tried everything to permanently change it. Am I missing something here?

[06-wrx]

I am not sure because I haven't gotten my defi gauges yet, but it seems like u are losing memory. Does the control box get a constant +12 volt source. If so maybe u are not connected to a true constant source and it's causing it to re-set every time u shut the car off.

[Snakes]

I thought about that but its not "losing" all settings. It's just reverting back to the previous settings.