The tach in the first picture appears to be from a 62-66 Pontiac. Here's a current eBay listing:
http://cgi.ebay.com/ebaymotors/1962-...item45f7e5ce9c
And here's a website with a few other examples. The photo 2nd from the bottom shows the unit out of the case:
http://www.pontiacparadise.com/parts...tachs61-62.php