a tach question for the experts

this might be one of my mind melting moments, but I seem to remember a tach by the name Drag-On. What made this thing stick in my head was the fact that it had a 7" face. thing was almost as big as a pie plate. I remember thinking it would be a great addition to my three and three-eights inch autometer water and oil gauges.
searching has got me the autometer gauges again, however the tach is eluding me.
any of you experts ever heard of this thing, or is it just one of those memory glitches that seem to be happening to me lately.
thanks for any help.

 

back for the morning crowd maybe?