Hi I just purchased a evolution, I found loose plugs behind the factory stereo system. From what I can tell the car used to have a sound system that was removed. There are mysterious plugs are wires i need help identifying. They vary in length from 1ft to 8ft long!

 

Most likely wires to gauges that have been removed.
The sensor in the engine compartment is to a boost gauge.

 

Agree with what Peter2F said, definitely wires for gauges that have been removed

 

Thank you!

 

Those wires go to a aem digital gauges

 

Agree on Aem connectors

 

The white connectors do look like AEM connectors but that Boost gauge solenoid is not what AEM uses, at least not currently.
Probably had a different brand for boost.

 

The two Bigger White connectors ( 6 Pin and 4 Pin ) are for an AEM Wideband Gauge Type controller...

 

The two smaller 4-pin connectors look like Defi gauge connectors.

 

awesome thank you everyone. Wouldn't new gauges come with all new wiring? Wondering if I should just rip them out