Date:         Mon, 8 May 2000 18:32:43 -0400
Reply-To:     David Beierl <dbeierl@IBM.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@IBM.NET>
Subject:      Re: Oilpressure LEDs
Comments: To: Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
In-Reply-To:  <v01550101b53c14a015d0@[139.80.94.12]>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 18:23 5/8/2000, Andrew Grebneff wrote:
>a VW engine since the previous owner). I understand, perhaps wrongly, that
>there are 2 LEDs; one for idle-speed oilpressure, the other (coupled with a
>buzzer) for higher rpm? The PCB mentioned by Gary McEachern on 31-10-99,

There is only one LED.  There is a smallish L-shaped circuit board inside
the speedometer (because there was room there, nothing to do with
function.  That board takes inputs from (coil, I think) and from the two
oil senders, one of which opens circuit at 0.3 bar, and the other which
closes at a higher pressure -- around 1 bar I think.  Its output controls
the LED and buzzer (the buzzer may be actually on the board, not sure).  At
< 2000 rpm, the controlling signal is the low-pressure sender, and the
light is lit (maybe blinking?) when the sender is closed.  At or above
2000, the controlling signal is the high-pressure sender, and the LED
lights and buzzer sounds when the sender is open.  I don't know what
happens if the hp sender indicates ok and the lp sender indicates bad above
2000 rpm, but I suspect that the lp sender is ignored in this case.

david
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"