We have an Auto-Gage tach in my dads car and that thing is a pile. Needle sweep is not smooth and shift light settings dont always take.

Also, be weary of purchasing parts like this from Ebay, lots of chinese knock offs out there that work even more poorly than the originals.

I agree, spend the extra bucks and get a quality piece.
http://www.summitracing.com/parts/atm-3690/overview/