does the ScanGauge Compact Computer have any instruction manuals?”
Scan Tool The ScanGaugeII includes a diagnostic scan tool that can check for Diagnostic Trouble Codes (DTCs), clear the codes, and turn off the “Check Engine” light on 99% of 1996 and newer vehicles. (However, this feature may not work on some trouble codes in Dodge vehicles.) If any DTCs are found, the ScanGauge will show how many there are as well as the codes themselves. Then you can use the Internet or repair manual to find out which is the failed part is, so you can repair it yourself or know what needs to be fixed at the mechanic’s shop.