I found one on Craigslist and had it reworked with new electronics, cost me 200.00 for the rework and 85.00 for the used tach, They make a reproduction one that goes to 10,000 rpm that is probably the smart move. This tach was a available option on my 66 gmc it comes in a chrome case which I did not use. Kieth
stock gmc dash:
http://kieth.smugmug.com/Trucks/66-G...67555848_rHzxh
After dash update (same dash panel just updated it):
http://kieth.smugmug.com/Trucks/66-G..._X8WmmMg-XL-LB
The older tach only went to 5000 rpm and it has manual pointers for low side shift point and top rpm shift point.....
On the far left in the same picture you can see a sun Batometer found that NOS on craigslist . Kieth