I found one of the 5K sun tachs on craigslist using searchtempest, this allow you to search all of craigs list for a given item. I paid $85.00 for my tach and then send it off to Williamsons in Hot Springs, Arkansas they rebuilt it for $200.00 then put it in my 66 gmc.....it works like a champ.
so go here and look for a tach it will also pull up ebay but you can skip over that stuff. Kieth
www.searchtempest.com