Oil Pressure Electronics

From VanagonWiki

The 86 and up Vanagon has an oil pressure monitoring and warning system called "Dynamic Oil Pressure Warning System".

It is based on two oil pressure senders (switches), one 0.3 Bar and the other 0.9 Bar. The two senders operate in reverse sense to each other - One closes when pressure is reached, the other Opens (can't recall which is which right now).  One is located near the oil pump, the other near Head #3 (front left).

Both sender's signals reach a electronic circuit which is located INSIDE the speedometer (this is the "Dynamic Oil Pressure system").

The system operates as follows:

1. When motor is not turning, the oil warning lamp lights up.

2. At low revolutions and with pressure above 0.3 Bar, the lamp turns off.
3. At over 2000 RPM, if the high pressure (0.9 Bar) sender doesn't activate, a loud onboard buzzer is activated to warn of this condition and the warning light flashes.

The unique idea of this system is that not only does it warn of no oil flowing in the motor, but even requires HIGHER pressure for higher rpm's, that otherwise would endanger the motor.

(P.S.: The above was written from memory. Any corrections are welcome...)