Had two complete units and sold them to 2 guys on this forum. They should have the manuals and should see this post. You might also find the manuals online or on eBay. If you post a picture of the front of the scanner, I can probably tell you how to set the scanner for the V6 Fiero. DONT USE IT UNTIL IT IS PROPERLY SET or you will burn it out.
From memory for the V6 only:
Set dial to C1 Pont PFI
Insert Plug into diagnostic connector
Insert plug into cigarette lighter socket. Unit wil power up
Screen will flash 85 0r 86 Chose 86 for 86-88 ECM.s All the same. Hit select switch
Screen will flash three different times. It will show Open (OPE) or Closed loop (CLP) or SPE operation. Hit select switch again to choose closed loop
Start engine .
Rotate selector switch to read the signals for each sensor. Use hi/lo switch to select reading for each position
Important to allow the engine to warm to operating temperatures to get accurate closed loop readings.
------------------ " THE BLACK PARALYZER"
-87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 12-25-2016).]