+1 On the Pantera Place Link to the electrical diagrams. If you are going to tackle wiring yourself, then there is no better teacher than OJT.
The horn issue can very well be in the switch. I had a solder connection come loose, and I would honk the horn every time I would signal a right turn
Oil temp gauge or oil pressure? Pink is the power for all the gauges.
The yellow with a black stripe is the + power for the instrument lights. It should be plugged into the rheostat.
As a general rule, Pink is the + fused circuit power in any circuit. In the case of the cigar lighter, the blue is the +12V and the orange is the illumination for the light. Black is ground.
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