Acts like engine shuts off while driving

What is your question?

A few weeks ago some repairs had to be made on my van, it drove fine until last week when engine overheated. I added water and has been fine since. 3 days ago while I was driving the dashboard was acting crazy. Made a sound, like shutting off and all gauges turned as though the engine was shut off but then everything comes back to normal. The engine doesn't stall but at times the low fuel alarm sounds off then goes back to normal. Then the msg window rotates from "change engine oil" to "low fuel" to "battery" to "security". All the while the engine drives perfectly fine. What is going on?