I just took a set of gauges off of a 1986 Audi 4000 last weekend.  The pressure
gauge sender was screwed to the side of the block, one wire coming off it.  About
1.5" diameter round.  The connection on the pressure sender can be connected
directly to the pressure gauge, along with neg. and pos. power and you will get a
pressure reading.  I have tried this.  In the above situation (parts from 1986
Audi 4000 and installing in something else), the dynamic light system and the high
and low pressure switches are not involved in getting the pressure gauge to work.
The oil temp sender looks like a water temp sender (same small size) and is
connected to the gauge in a similar manner.
I guess the voltage should be stabilized to get accurate readings, power supply
from existing gauges?

Gary Lee

Patrick Foltz wrote:

> Ken Wilford and I were discussing the use of pressure and temp guages taken
> from junkyard audi 4000's and are in question about the pressure sender.  Is
> the light/guage sender on the filter housing for the high side (ie, OPENS at
> the twentywhatever psi) or for the low side (closes at 4or6or8 psi)?  The car
> I'm getting my guages from has the two senders (One on the back of the head in
> addition to the sender on the filter)  Does anyone know this answer, or happen
> to have  bentley for the audi  (actually any vw with the dynamic system) and
> can tell us positive, so I can run over to the yard, get the guage and let it
> sit on my toolbox for six months while I try to find the time to install it!
> Thanks, Patrick