Triggering Data Acquisition with continuous 5V source, NI 9401, and NI 9263

This is my current VI. I have a sensor that sends a mA signal and is converted to height and two thermocouples that display in real time. I have a cDAQ 9185, an NI 9207, an NI9210, an NI 9401, and an NI 9263. I need a continuous 5V source so that when the wire is connected, the input reads it as a trigger and starts acquiring the data for the amount of time predetermined in the time target. I have been struggling with this for awhile and I am new to LabVIEW.

Also, I need to connect another trigger the same way but this time when the wire is connected and the 5V is read back to the DAQ, I need it to make a mark on the graph each time it is hit to mark a period of time within the data acquisition.

Thanks!