Hi Mark, I guess I'm still not getting this. Please remember that I'm
dealing with a 1.9L version here.

The sender has one wire connected to it, blu/blk, according to the
wiring diagram on 97.56.

What do that sender do? My first guess:

Pressure too low = switch closes, connecting the blu/blk wire to
ground,
Pressure okay = switch open, blu/blk wire not connected to ground,
Pressure high = switch closes again, blu/blk wire connecting to ground
again?

Thanks for your patience,

--
Rocky J Squirrel

On Sun, 2011-04-10 at 08:56 -0700, mark drillock wrote:

> The buzzer is only used for the high rpm pressure switch. The low
> pressure switch just triggers a blinking led. The high switch triggers
> both. I'm sure this is done so there is no alarm sounding when you have
> the key on but engine not running. The alarm is loud enough to be heard
> over all the other sounds while driving so it would be too loud with the
> engine not running.
>
> Mark
>
>
> Rocket J Squirrel wrote:
> > Well, I wasn't trying to get all fancy like that. This being an 84
> > model, and if the wiring diagram on 97.56 isn't lying, then just wiring
> > a buzzer in parallel with the idiot lamp should give an audible alarm
> > whenever the oil pressure lamp lights.
> >
> > There's only a single wire running from the op switch to the dash light,
> > according to the diagram, so it can't be any fancier than that.
> >
> > Unless the wiring diagram is inaccurate, of course.
> >