There are diagrams for the 68 posted on this forum in the threads above.
You should have a white/red wire running from your oil sending unit to one side of your oil pressure gauge. The other post on the gauge should have a black/white wire going to the constant voltage regulator mounted on the back of your instrument cluster
You should have a white/red wire running from your oil sending unit to one side of your oil pressure gauge. The other post on the gauge should have a black/white wire going to the constant voltage regulator mounted on the back of your instrument cluster