Hopefully others will chime in. When I installed a new speedometer gear in my tranny, I noticed that I was a constantly 10 mph faster than what my speedo was saying. So I took my truck in to a local speedo shop and they put my truck up on a special rack with rollers and started up the ole truck to see what it's speedo was reading vs what the rollers were reading. They agreed with my findings and made an adapter that bolts between the speedo cable and the speedo gear. This adapter can be either a reducer or increaser depending on what you need.

Nevertheless now my speedo is reading true speed.


Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.