Hi, I recently installed a tow bar on my 06 VE commodore and after I had finished and out all the electrical back together I noticed that my instrument cluster isn't working, the speedo isn't working, the temp gauge isn't even working, there is no chime when I go to start it absolutly nothing is working on the tacho, not even the controls on my steering wheel.

How can I fix this? I recently also just had a mechanic look at it and try and reboot the system but that still didn't work.