I've always been fond of Sunpro Tachs, I have a vintage (at least 40 years old) 90* Sweep Sunpro Tach in my '84, a 5" Sunpro Super Tach III w/ Shift Light in my '73 Duster, had a Sunpro Super Tach II in my '74 Duster (now 5" Autometer w/ Shift Light), a Sunpro Super Tach II in my '48 Dodge, '65 'Cuda, '75 D300 and '76 Ramcharger.

You can pick up brand new Super Tach II's for about $25 - $30