Chevy Schematics

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Where can I find a Schematic for a 1969 Chevy truck dashboard ?

I inherited this truck from my Brother, and the water temp gauge doesn’t work, neither does the oil pressure gauge or the battery gauge.
I can’t find where to hook up either of these gauges, and i don’t have a manuel.
The oil pressure gauge is hooked up, with a solid steel tube. But i don’t know where it goes. The Oil pan ??
The water temp and the Battery gauge have no wires. I don’t know where to hook them up.

oil to the back of the motor behind intake and beside the dist., probably a stem there for the hook-up.
water to the drivers side of the block. Should be a ‘plug’ looking thing about a color of brass and would probably have a tab on the end for the clip. Around the 2nd plug (#3 plug wall) area.
Alt gauge to the passenger side of the alternator clips. Should bo a set of clips there and you want the right side.

1986 Chevy K20 Vacuum Diagram