I've settled on the VDO "Cockpit Black" series of meters for Mellow
Yellow's upcoming gauging project.

Looking at eguages's offerings in the 2-1/6'' diameter size, 4000 rpm
range, I find two very similar gauges.

One is the 333 365, the other is the 333 369. They have very similar
prices and seemingly the exact same specifications:

For use on 4,5,6,8 cylinder application engines with standard
coil ignitions, most square wave electronic control ignitions
with tachometer output terminal, and alternators with "w"
tachometer terminal.

Eguauges does not know what difference there is between them. After some
searching, I found this:

333 365 is 4,000 RPM (400–1300Hz)*
333 369 is 4,000 RPM (800–2400Hz)*

where * = For Alternator use only

Can someone help me figure out which gauge will read correctly when
connected to the coil? Maybe they both will, but this difference of 2:1
in the frequency spec gives me pause.

--
Rocky J Squirrel
'84 Westfalia: Mellow Yellow ("The Electrical Banana")
'74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.)
Bend, OR
KG6RCR