When I first bought my car when the ignition was turned off the HU would keep going for a few seconds then switch off.

After fitting a KLink and Gauges when the ignition goes off so does the HU.

I don't know why its changed from one to the other? I can't work out whether I've moved a wire or something in the back of the HU or I've changed the arming of the HU.

Any ideas?

 

Possible capacitor in the circuit? This could be enough to keep the HU going for a VERY short time, adding the Knock link and the guages has made the cap discharge quicker. Just a thought.