There is a place called, Bob's Speedometer Service, ph#248-473-9006. It is in Farmington Hills, Michigan. If you call, they will ask you a few questions about your rear end gear ratio, tire diameter, etc. Then for about $35 they will build you a speedo reduction cluster, it is in a small aluminum box that hooks up in line between your speedo cable and trans. If you provide the correct info, they will gaurentee speedo accuracy. I was happy with their service.
'69Z 23,000 orig. miles
Rallye Green/White stripes