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Old 07-22-2007, 05:29 PM
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6 volt pos. ground elect.oil psi gage

has anybody ever heard of a 6 volt pos. ground oil psi gage? and if so could you please let me know where i can get one.
don't like the idea of having a oil line in the car with me after putting in new carpeting and stuff.
thank you for the help.
rick

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Old 07-23-2007, 02:14 PM
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Doc here,

Voltage is NOT the issue here..it doesn't care..Polarity is...an oil sender is a passive, resistive device.

Is the Gauge you are using Positive or Negative Polarity?

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Old 07-23-2007, 04:23 PM
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i haven't bought it yet doc but i think the one i seen at the auto store the other day would be neg ground
i was hoping some one would have a lead as to where i could get one for pos. ground. or be Abel to change one to pos ground
thank you for the reply
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Old 07-23-2007, 05:03 PM
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Quote:
Originally Posted by rick laplante
i haven't bought it yet doc but i think the one i seen at the auto store the other day would be neg ground
i was hoping some one would have a lead as to where i could get one for pos. ground. or be Abel to change one to pos ground
thank you for the reply
fords from 1948 and back wher postive ground, try some of the old car parts guys, what ar you useing the gauges for.you need the corect sender and gauge, i tried to get ford gauges to work with other sending units to no avail. some one out ther may be of more help cliff
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Old 07-23-2007, 05:21 PM
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i am planing on using it in a 55 thunderbird i don't like the idea of running a oil line in to the car after putting in new carpeting
the guy i bought the car from had a steal line in and i was starting the car and the line broke thank god i did not have new flooring in at the time.
if all Else fails i will more than likely run the idiot lights.
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Old 07-23-2007, 05:55 PM
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Doc here,

If you use and connect a Negative Ground gauge in that car, It will indicate Backward..(wiring it normally)

To DO that, the gauge MUST be isolated off Ground, (no part of the gauge may come in contact with the body) Then, you can use a non conductive fitting at the block for the sender , along with a two wire sender. Fuse at 1 amp.

BE ADVISED: if something slips down the road on the gauge mount, you have a DEAD short to ground..

Another option is run instrument regulators, 6 to 6 volt 1 Amp 78XX Type Regulators..Fuse the input at 1 amp, fuse the Output at 1 amp, Fuse the ground at 1 amp...and be advised the REGULATOR (S) must be isolated off the body as well..(It's a positive regulator)

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Last edited by docvette; 07-23-2007 at 06:00 PM.
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Old 07-23-2007, 10:14 PM
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Dodge pickups thru at least 1956 used 6 volt positive ground system. Not sure about the cars, think they did also.
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Old 07-23-2007, 10:43 PM
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Quote:
Originally Posted by rick laplante
i am planing on using it in a 55 thunderbird i don't like the idea of running a oil line in to the car after putting in new carpeting
the guy i bought the car from had a steal line in and i was starting the car and the line broke thank god i did not have new flooring in at the time.
if all Else fails i will more than likely run the idiot lights.
you should be able to find a sender and a gauge unit for oil pressure, try some t bird stores, last one i did had trouble getting sender for temp but so problem with oil pressure. cliff
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Old 07-24-2007, 08:10 PM
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Kaisers were also positive ground and used a pressure sender and wire set-up
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Old 07-26-2007, 07:52 AM
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thank you all the help i will keep looking for a gage but if i can not find one i will use the lights or run a copper line as much as i don't want to but to not know if there is a problem with the oil psi is worse than getting oil on the carpeting.
again thank you all and if you come up with something please let me know
rick
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Old 07-26-2007, 04:20 PM
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Quote:
Originally Posted by rick laplante
thank you all the help i will keep looking for a gage but if i can not find one i will use the lights or run a copper line as much as i don't want to but to not know if there is a problem with the oil psi is worse than getting oil on the carpeting.
again thank you all and if you come up with something please let me know
rick

Doc here,

If it ends up you need to go to SS or Copper line..

A good fail safe that has worked for me, is get some rubber hose that will fit over the Copper nut/Compression nuts and the line..and run that all along the line out to the engine bay...

Use a hose clamp on the gauge compression nut and hose, (right up to the gauge as close as you can get it.) and leave the sender side open to the air, Do not clamp..

Set the line at a slight grade all the way (so any leaky oil will follow gravity inside the hose, down the hose and out of the car) and that should protect the interior. IF it leaks, it will flow out into the engine bay and on to the ground.


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Old 07-27-2007, 07:42 AM
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thanks doc that sounds good to me
rick
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