The Interstate speedo is electric, the Standard/Tourer is mechanical.
You can either get an aftermarket electronic speedo or speedo/tach, maybe an aftermarket mechanical drive, or switch the speedo over to the stock Std. model. Here are the Dakota Digital ones that have been mentioned:
http://www.dakotadigital.com/index.cfm/page/ptype=results/Category_ID=560/home_id=-1/mode=cat/cat560.htm If you decide to use the stock standard model you will need to get a cable, the speedo head and the mounting hardware to fit it to the bike. Here is the fiche for a '99 Std., it also shows the matching Tachometer - not sure what you would need to do to wire that up but if you check the schematics you can likely figure it out.
http://www.hdlparts.com/fiche_section_detail.asp?section=148152&category=MOTORCYCLES&make=HONDA&year=1999&fveh=3467 Somebody had a speedo head for sale on the classified board a few days ago not sure if it is still available and whether it is KMH or MPH (suspect MPH likely from an American bike imported into Canada).
The KPH ones may not be available from the States. If you would rather have one in KPH and want to price them here in Canada to see how it compares to your local price then send me a message and I can check price and availability with a phone call. I bought one about a year ago and got it in a few days from the Honda warehouse in Canada.
