This listing is for one Genuine Yamaha Tachometer Rev Counter 396-83540-00 AS3 RD125 73-75.

As far as I know, the first AS3 models with tachos had a red line at 9000rpm, so this item is for the 396 model from 1973 on with a 10000rpm red line - it was known as the RD125 by then in most markets, but some also used the AS3 tag, hence why I've included that in the title. In 1976 the RD125 1E7 model was introduced, also with a 10k redline on the tacho and looking similar, but the wiring and the fixing studs on the rear are different.