ok I just bought my 02 wrx and it has 2 aftermarket controllers/computers installed in the dash. One measures voltage, wheel rpm, timers, etc. but the other is an air/fuel regulator by HKS. It has 3 knobs on it: Rsp, Idle and Gain. Does anyone have any idea of how to work either of these or maybe know where i can find out how to utilize them? any help would be appreciated!
e-mail me at efmd3@yahoo.com if you want to see a picture of the other dash device.