Has anyone tried to connect common gas tachometer to alternator's (diesel)
w -terminal?  Does the meter need adjusting?  Or does anyone know what is
the rate of the pulses from w -terminal/crankshaft round?

I know the accuracy of w -terminal is not quite good but I think it is
enough for me.  This is my first diesel and my ear doesn't say rpms => I'd
like to add tachometer and not VW's own.

I could calculate pulley ratios and measure the amount of pulses /alternator
round but I think it is the hard way.  I am capable to build any divider or
pulse shaper if necessary.

Thanks,

Juha Koivisto
88 Vanagon (Caravelle) 1,6TD (old school bus with 9 seats)
TURKU, FINLAND