From what it sounds like you are on the correct path with the security system. If there is a fault or improper "hand shake" then this system will shut the car off. So the symptom is it starts just fine and after a second of run time it shuts down.
When it does this, there is usually always a diagnostic trouble code (DTC) that goes along with it. Without that DTC, we are shooting in the dark.
I suspect you have a greater wiring issue which is why your gauges went out but again, there isn't a clear direction to go without those codes.
In my experience, you could go start checking things that may be related and maybe get lucky but in most cases you are wasting your time and in that amount of time, you could have had it scanned, got the code and got it fixed.
Most part stores have these scanner and do it for free if you are in their parking lot but that doesn't help you right now. However, most of them are willing to come a short distance and scan it for you with the idea that whatever parts you need you are going to buy from them. So if you don't have a scanner, this is worth a try.
Once you get the DTCs let me know what they are and we will get it fixed.
Saturday, April 13th, 2019 AT 7:29 AM