[DeTomaso] Oil Pressure Gauge

Thu Sep 1 21:38:44 EDT 2016

I admit I am in error.  Sorry I caused confusion, but I have learned
something myself.

It seems the more I search online the more conflicting garbage I find.  

I did find today where someone was having question about the OP6091 and
performed a test using their air compressor.  (Something that might be
interesting to do)

Their posting;
"...testing with a regulator, mechanical air gauge, air hose connected to
the Napa sender OP6091 and the Veglia gauge.

Zero to ten psi air the sender remains an open circuit, so Vegila showed 0
until 10 psi air
when the Vegila showed 17.5 psi, the mechanical was 15 psi, with 38 ohms
when the Vegila showed 35.0 psi, the mechanical was 30 psi, with 24 ohms
when the Vegila showed 52.5 psi, the mechanical was 58 psi, with 17 ohms
when the Vegila showed 70.0 psi, the mechanical was 94 psi, with 11 ohms"

Joe/nc

-----Original Message-----
From: Mike Thomas [mailto:mbefthomas at comcast.net] 
Sent: Thursday, September 01, 2016 20:36 PM
To: 'Mike Drew'; 'Joseph F. Byrd, Jr.'; detomaso at server.detomasolist.com
Subject: RE: [DeTomaso] Oil Pressure Gauge

I did pick up a new sender from NAPA: The box it came in has the numbers
OP6091/Sender.  When I enter that number into the NAPA website, it comes up
as sender, gauge type.
Mike

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf
Of Mike Drew via DeTomaso
Sent: Wednesday, August 31, 2016 8:46 PM
To: Joseph F. Byrd, Jr. <byrdjf at embarqmail.com>
Cc: <detomaso at server.detomasolist.com> <detomaso at server.detomasolist.com>
Subject: Re: [DeTomaso] Oil Pressure Gauge

Joe,

Their website calls it a switch, but it's actually a (variable) sender. 

One could make the case that one for an idiot light instead of a gauge could
be termed a switch, but that's not what this one is. 

Having said that some people have made he mistake of installing a light
sender for a gauge sender, and that one then pegs the gauge. But Mike's
gauge was working properly for years and only recently did it flake out. 

Mike

Sent from my iPhone

On Aug 31, 2016, at 19:34, "Joseph F. Byrd, Jr." <byrdjf at embarqmail.com>
wrote:

> Just saying....When I google NAPA OP6091, I get a SWITCH.  
> You could use a DMM and see if not running you have "open" and once 
> cranked "closed".  A sender would have about 70 ohms not running and 
> approaching 0 running.
> 
> I would still want a mechanical gauge locally.  ( I like Marshell's 
> for
> automotive)
> 
> Joe/NC
> 
> -----Original Message-----
> From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On 
> Behalf Of Mike Drew via DeTomaso
> Sent: Wednesday, August 31, 2016 20:37 PM
> To: mbefthomas at comcast.net; detomaso at server.detomasolist.com
> Subject: Re: [DeTomaso] Oil Pressure Gauge
> 
> 
> In a message dated 8/31/16 17 26 15, mbefthomas at comcast.net writes:
> 
> 
>> I'm trying to figure out why I'm getting a pegged reading on my oil 
>> pressure gauge.  It will show normal pressure as the car starts, but 
>> soon after pegs to the right and stays there.  Everything runs fine 
>> otherwise.  I've swapped out the pressure sender, NAPA OP6091, and 
>> it's still pegging, so I'm suspecting the gauge.  Anything else I 
>> could check?
> 
>>>> Calling Bill Taylor!   That is, assuming it's an electrical.   You
can't
> make that assumption though.
> 
> I *think* I may have stumbled across something.   Doing some primitive 
> Google research, I confirmed what I thought I knew, which is that the 
> oil pressure gauge works by taking 12V power in, which runs across the 
> gauge, then out
> to the sender unit, which is a variable ground.   The reading given by the

> gauge depends on the resistance of the sensor unit; this in turn is 
> determined by the engine's oil pressure.
> 
> Extremely high readings after a cold start, if they are accurate, mean 
> the pressure relief valve near the pump and filter has probably stuck.
> The engine should be switched off or the oil filter could burst.
> 
> I have a mechanical oil pressure gauge which threads into the hole
normally 
> occupied by the electric sender.   It is used to 'sanity check' the 
> readings on the gauge.   It's the first troubleshooting tool; if the
> mechanical
> gauge reads high, you have an engine (or at least oil filter) problem.
If
> it
> reads normally, you have an electrical problem.
> 
> I could mail it to you tomorrow and you would have it by the weekend?
Let 
> me know if you would like to try it out.
> 
> Mike
> 
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