I was a gray market importer in the 70's and 80's and NH Speedo replaced the euro faces, did all the recalibrations, changed gears, etc. quickly and reasonably. I probably used them 3 or 4 times a month and was really happy. They did the speedos out of Lambo's, MBZ, BMWs, Porsches. Looked and worked as original afterward. Perfect!