Where Is All The Tech Help

The Plug I Call A Revolver Plug Looks Just Like The Cylinder In A Gun, It Plugs Into The Back Of The Gauge Circuit Board And All The Gauges Get Their Feed Off Of It. The Gauges Worked Before I Started The Rewiring Project And Now They Don't. How Would A Rebuild And Calibration Help If They Are Wired Wrong. I Am Not Being A Smartass But Don't Want To Spend Uneeded Money. I Do Understand You Do Excellent Work And Would Be Where I Would Go To Get It Done. Could We Have Fried Something By Putting 12v Where It Didn't Go?