I am in the middle of fitting blue stepper gauges into my car and I've connected the power, earth and ignition left the dimmer wire for now. I have power up to the plug that connects to the back of them but when I plug the gauge in there is nothing, No lights. I haven't done the sensors yet do I need to do them before the whole thing works?

Got Boost, oil temp and pressure!

Thanks claire

 

All working now