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When you turn on the key switch you should have power at the red wire. If you don’t then you have a blown fuse. This is assuming all the ground connections are good and clean.
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You are correct. The bottom right terminal post (K) is for the light.
The center post (G) is for all ground connections. This must also be grounded to the engine/chassis.
The left post (S) is for one of the leads from the reluctor, the other connects to the ground. These two wires are probably siamezed in a sheath. There should only be one lead connected to the (S) post.
The red lead is the 12v+ feed from the fuse block and it also powers all the other gauges. It is fed from the key switch.
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There is a wiring schematic in your owner’s manual. It shows three working leads for the tach.
- Wire #23 12v+ feed.
- Wire #6 to reluctor.
- Ground
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A picture of the back of your tach would be extremely helpful.
Your reluctor consists of a coil of wire around an iron core. Nothing magic inside at all. All it does is measure the difference in the magnetic flux field as a flywheel tooth passes by, and this difference is seen as a sine wave. The reluctor has two leads, it doesn’t matter which one is grounded. If the reluctor has one lead, then the body is grounded
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