IMHO, placing a Sender/Sensor, be it Pressure or Temp, @ the end of a Dead End Tube

is a Very Bad Idea > In the case of a Temp Sensor it could be next to impossible to get Fluid

to it that is Relevant & in the case of Pressure,, If You happen to end up with an Air Bubble

Trapped Between the Fluid & the Sensor You Most Probably May Not get Accurate Readings ~

                                                                ORR ~ DeanB

> On 10 May , 2021, at 9:43 PM, Gene P <olgreywoof@GMAIL.COM> wrote:
> 
> Hey folks,
> 87 Wolfsburg 2.1, original everything
> I don’t think this is a problem, I’m just wanting to learn something.
> For years I’ve had VDO oil pressure and temp gauges, senders on a sandwich adaptor at the oil filter.  Start-up pressure has been just under 80, right at the top of the gauge, in any season.
> 
> As part of a recent project, I pulled the sender between the pushrod tubes and put that with the VDO sender on a tee about 7 inches forward of that port.  Now start-up pressure is about 55-57.  Would moving the sender in that manner cause a change, or that much change, in the reading?
> 
> The other change I made (burying the lead I think) is switching from Castrol 20W/50 to Mobil1 15/50 for the first time.  Does synthetic oil make that much difference in start-up pressure?