Vintage Airguide Surface Mount Marine Tachometer RPM Gauge 6 Cylinder

This is a complete tachometer set off of a 1965 Slikcraft outboard boat. Untested but in pretty good shape. I am assuming it works if you can wire it up correctly. Sold as is. The wire insulation was fabric and fell off. I dont have a wiring diagram to be able to test it. Comes with the 3 original screws to install the gauge to the dash. This came off of a 6 cylinder 2 stroke motor and most likely only works on a 6 cylinder 2 stroke. It might work on a 4 cylinder but with out an origin...al wiring diagram I have no idea. There is little to no information online on how to wire this properly. You would either need another gauge to compare wires too or have prior knowledge on this gauge to get working. I did not pay attention to how it was wired on the boat when removed because it was just twisted together and all the colors looked the same. There is no model number on this and the wires dont have alot of color to them. Just yellows and browns. It seems that these gauges are very specific to the engine type by the model number, they were not very universal. Note that the dial in the middle moves to your desired max rpm for reference only. Will be shipped safely. 

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