I'd like to agree with Dennis, but if you had the wrong sender you'd get no
blink with key on/engine off, and constant blink any time oil pressure was
over ~13 psi.  That does not sound like what you're experiencing.  Time to
get in there with voltmeter and see what the sender is actually doing, and
pressure gauge to see what the engine is doing.  Maybe the L-board is flaky?

Yrs,
d

On Sat, May 27, 2017 at 6:55 PM, John Lauterbach <john@jhl.mgacoxmail.com>
wrote:

> Thank you very much, David.
>
> Mystery continues.  My Son and I checked oil before we drove from the
> TBA.  Oil level fine.  I took the van for a spin.  No buzzer over 2000 rpm,
> so the ground wire is in place.  At more than light throttle, oil pressure
> light flashes at same periodic manner than if sensor disconnected.  If I am
> say at 2500 rpm, and take my foot off accelerator pedal, light goes out.
> Putting moderate pressure on pedal causes it to go on.  After driving
> around about 15 minutes, oil pressure light seemed to return to more nomal
> operation.
>
> John
>
>
>
> On Sat, May 27, 2017 at 5:35 PM, David Beierl wrote:
>
> http://www.oldvolkshome.com/late_van_cluster_install.pdf
>>
>> Yrs,
>> d
>>
>> On Sat, May 27, 2017 at 5:20 PM, John Lauterbach <john@jhl.mgacoxmail.com
>> >
>> wrote:
>>
>> Had to let my local TBA deal with an apparently defective oil pressure
>>> switch.  Switch replaced, but oil light was flashing regularly at idle
>>> when went to pick up van.  Got a call this afternoon.  Mgr. claimed wire
>>> was disconnected at instrument panel, and when shop reconnected it,
>>> light was off at idle, but came on steady at slight acceleration. Never
>>> any problems with oil pressure other than recent switch problem. Engine
>>> is 2003 Boston Engine long block.
>>>
>>> Van has late model instrument cluster (from batch available in 1999). I
>>> have lost crib sheet for wiring changes required this instrunent
>>> cluster.  If you know of where I can find one on Internet, please send
>>> me the URL.
>>>
>>> Thank you,
>>>
>>> John
>>>
>>>