Hello all. Picked up an 88 turbo 4x4 wagon........ I need a little help with the dash turbo light(s). There is the turbo light itself (I assume) and a square light around it. What do each represent ? Sometimes the green square around the turbo light itself comes on, usually when it is under load and on the skinny pedal real good. Couldn't find much on this anywhere. Thanks for the help.