As told before: the better Ames tach (Ames was offering 2 tachs at some point, a cheaper one and a more expensive one, the latter told by themselves to be much better) is definitely the tach produced and sold through ThePartsPlace. I didn´t trust ThePartsPlace at that time, so I ordered the Ames´ tach -- only to see that they even didn´t bother to erase ThePartsPlace sticker on the tach box sold through Ames...

Concerning the source Terry mentioned I´m not familiar with. Never heard of a better tach than the Ames/PartsPlaceTach although the PerformanceYears tach comes VERY close (and shows the correct 68 steel blue colored becel). There are only minor differences...

Using the Ames/PartsPlace tach with a pointless Pertronix Ignitor for a period of 2 years now I never had any issues...