85 2.8 ltr wire harness

Ok I Need A Lil Help, I Just Bought A 85 Blazer From Some Crack Head That Tore Out The Entire Dash ,and I Do Mean Entire!anyways I Got The Heater Controll The Headlight Switch And The Ignition Wires All Hooked Back Up Correct And Now I Have This Clump Of Wires Where He Clipped Off The Plug That Goes Into The Light Blue Box That Had All Of My Gauges And Speedometer ,tach Etc In It,can Anyone Tell Me What The Diffrent Wires Go To? I No Longer Have The Plug That Went Into Itjust A Mess Of About 14-16 Wires. And If No 1 Can Answer That Can Anyone Give Me Some Info On How To Hook Up At Least A Working Fuel Gage And Speedometer Or Tach? I've Walked Many A Mile In The Month That I've Owned It Cause I Never Know How Much Gas I Have ! Please Help