The tach I bought wired right up with no problems or adapter. I did not state the type I wanted just clicked on buy it now, because I assumed the R* was a dual fire. It was on sale for $47.95 . I noticed thay have almost doubled the price now... But here is what they say.
This listing is for a Mini Tachometer that features a white face and reads to 8000 RPM
. It has a stainless steel housing and is designed for 2 cylinder 4 stroke motorcycles. It works with dual-fire ignition systems, but will work with most newer bikes if a tach adapter is added for a single-fire ignition. Buyer must verify which type of system their application has. The handlebar mount's 2-piece design mounts directly to the handlebar with no secondary mounting system needed. It will fit on 1" bars only and requires 2" of space on the bars.
I repeat I used no tach adapter.... I don't know what else to say..But don't get me into this discussion because I don't have a clue... Butch P.S It could be the way I wired it. Or???????