Oil Pressure Sending Unit Thread Patterns

["content22207" <brobertson@xxxx>]

1/4" NPT is 1/2" actual pipe size. Is also 18 TPI. Don't think that
was stock...

John Hervey's senders are 1/8" BSPT. He advertises as stock
compatible, which would make sense because all the vacuum fittings and
the thermostat bleeder screw are same.

>From what I gather as DeLo late comer, stock compatible replacement
parts used to be much harder to come by. May explain things like
re-threaded oil pressure sending unit ports. My car didn't even have
electrical sender -- PO had replaced with capillary tube to under dash
gauge. Drilled and tapped to 1/2" NPT! Since dash gauge is 100%, can
only figure he couldn't find suitable electrical sender. Remember that
calibration is odd too: 0 to 80 PSI.

I had no trouble finding 1/2" NPT to 1/8" BSPT adapter. Would imagine
no matter what was done to block in the past, everyone should be able
to return to stock compatible sending units now.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "Dave Swingle" <swingle@xxxx> wrote:
> Jordan
> 
> I took a closer look at your pic - looks like you have the right 
> part, and the right place, but something is amiss in your car. 
> Someone before you has probably removed the thread adapter. The part 
> you have as the "new" one is the common part used, the threads on 
> your old one look way too big. What does the block look like with
the sender removed? 
> 
> The thread on the sender is 1/4 inch NPT, very close to metric M-1.0 
> pipe thread.
> 
> Dave S
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "Dave Swingle" <swingle@xxxx> wrote:
> > There are two oil pressure sending units. The large one next to the 
> > oil filter is the sender for the gauge. The small one above the 
> > catalytic converter is for the oil "idiot" light. Sounds like you 
> > have the right thing but are trying to put it in the wrong place. A 
> > common problem.......
> > 
> > Dave S
> > 
> > --- In dmcnews@xxxxxxxxxxxxxxx, jordan rubin <nuttenschleuder@xxxx> 
> > wrote:
> > > Hello all:
> > > 
> > > 
> > > For those who enjoyed my oil change howto, there
> > > was a second job i was doing while the oil was empty.
> > > 
> > > It was established that my oil gauge was at 80psi
> > > because the unit it connects to was broken.
> > > 
> > > I was positive this is what needed replacing
> > > shown on left with wire next to area without oil
> > > filter 
> > >