Here is the story as I know it. In 1966 or 1967 Harley took a Sportster and some factory technicians to the salt flats to see how fast it would go.
It was a "stock" bike very carefully tuned by the factory guys. When they ran it the top speed was just over 150 MPH. This was a Harley record not a Land Speed Record. However Harley was very excited. So to celebrate, they changed the production Sportster speedometer from a max speed of 120 mph to 150 MPH to commemorate this event.
The 150 mph speedo was used from late 1967 thru 1969. It was originally made by AC (it says so on the back) and is known as the first 150 MPH "BAR and Shield" logo speedo. It had two part numbers. I think the 59B was AC and the 59C was Smiths???This is the first use of the 150 mph speedo. It is made by AC.
There were many others to follow. In 1970 they changed the speedometer completely. There were other different "Bar and Shield" speedos used on later bikes. Not the same as this one. This is a relatively rare speedometer.That's what they all say. This one has only been used for 6300 miles, relatively low. It can be used on many different years as you well know. Also included are a few related parts. These were used on all models (XLH or XLCH) but the mount was different as per bike model. This speedo is from an XLCH, but is the same as the XLH. Also included is a XLCH only? I think it is correct for 1967-69. Sorry but I don't know the differences. Also the correct light socket and wire is included. The trip reset shaft is there but the small plastic knob is not. Also included is a matching 8000 rpm tach. Let's add one more part. Not really correct for 1967 but makes a great way to mount a speedo or tach.
Harley mounting bracket 67175-65 for the Speedometer or tachometer on a Sportster (parts book says 1965-66) they would attach to the top fork nut. I guess it was a cap nut that had a threaded hole in the center. Harleys' part number is 45756-65 fork tube cap w/valve.(not included) Using this bracket you could put the speedo on one side and tach on the other. Tack gauge number 3: I don't know what to do with this tach so you can have it also. Looks a little rough but seems to work. Years 1967 1968 1969 67 68 69. What we have here is 1967-68 gauges with 1965-66 mounting brackets. Condition is USED so look at the pictures and make sure it fits your application. This is what I THINK is correct for this speedo and you should do your homework to make sure it is correct for your application. Just trying to head you in the right direction. The item "Harley XLCH XLH Sportster 150 MPH AC Speedo & 8K Tach Smiths L1967-69 Ironhead" is in sale since Wednesday, October 2, 2019. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Instruments & Gauges\Speedometers". The seller is "guidoslibido" and is located in Takoma Park, Maryland. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.