You got the .9 bar switch operation reversed. It is normally open and when the pressure reaches .9 bar, it closes completing the circuit. This is a fail safe as having the wire fall off will cause the buzzer to sound. Unlike the low pressure sender where folks do not notice the light does not work before starting the engine.

Dennis

----- Original Message -----
From: Jfp w/2 WBXs <jfp7@HOTMAIL.COM>
Date: Tuesday, December 28, 2004 7:14 am
Subject: Re: 2.1 waterboxer oil temp gauge?

> Hi Craig,
>
> Unless you've disconnected the 2.1L Dynamic oil pressure warning
> system. The
> 0.9B switch is needed. It's a ground below 0.9B and an open above it.
> Without the correct signals the buzzer sounds. If you want access
> to the oil
> pressure circuit, go the 0.3B pressure switch on the left side of
> the 2.1L
> motor, near the push rods. Install a 1/8" pipe thread Tee using
> the 0.3B
> drilling, the 0.3B switch and the new temp sender. It may be
> necessary to
> modify the push rod tube splash shield. Home Depot has a full
> assortment of
> 1/8" copper pipe thread fittings. Use Teflon sealing tape on threads.
>
> Regards,      John
>