92 grand caravan w/3.3L, install a tach?
 

as the subject says, i have a 92 grand caravan with a 3.3 liter V6, and
i would like to install an aftermarket tachometer. but any that know
that engine know that it has a distributer-less ignition system (IOW,
no single tack signal). i was wondering if there was a signal somewhere
in this van that i could tap into, without too much extra work (like
building an adapter circuit).

failing that, is there a schematic of a circuit i could build to get a
tach signal?

i am aware that there is a tach signal from the crankshaft sensor, but
i believe this is a lower voltage, and most likely digital, so i didn't
want to make a circuit without first knowing if it could handle the
extra current draw without tripping the auto-shutdown circuit.
thanks in advance for any help.

~Travis