I have only done one gauge and here is the result. I hope this
works for all gauges.
Take the oil pressure sender and gauge out of the car. Disable your
car so it cannot be started. If car is started without sender, oil
will be pumped out through the sender hole and your engine will
seize up due to no lubrication. At a minimum take out the keys,
battery and the distributor rotor.
Make a test jig with a 1/2 inch three outlet pex style elbow and
plumb three 2 inch pieces of pex pipe to it. Crimp all connections
or they will blow apart under 60 psi. In one outlet screw in an air
pressure gauge. In another outlet screw in the oil pressure sender
and secure it with a hose clamp ot it will blow out. In the third
outlet screw in the air supply. I have a photo. How can I attach
it? If anyone wants the jig photo please Email me at
@Dennnis and put Jag oil pressure gauge in the subject line.
Using a 12 volt battery, wire the folowing circuit
wire from one terminal on oil pressure gauge to the sender male
spade connector
wire from the metal base of the sender (ie wrap bare wire around
the base where the thread are) to the -ve of the battery
On the back of the oil pressure gauge pull out the two cork bits
covering the adjuster access holes.
Gradually apply 60 psi to the sender (wearing safety goggles)
Wire +ve battery terminal to the other terminal on the oil pressure
gauge. In this wire you must put a 1 amp fuse. This is a safety
measure against short circuits. If you are not both qualified and
familar with electrical circuits, please find a qualified person to
do all the electrical
The circuit should now be live ie the gauge should read pressure
Wait two minutes for the gauge reading to settle
Looking at the back of the gauge, turn the left side adjuster
whichever way is needed to make the gauge point to 60 psi. The
adjuster slot needs a small screwdriver. The motion is to move the
slot perpendicluar to the slot direction. Moving the slot to the
right makes the gauge needle reading go towards zero, to the left
makes it go towards 60 psi. After you make the adjustment wait two
minutes.
Remove the 60 psi supply from the jig and watch the gauge reading
go towards zero. Wait at least two minutes.
If the gauge reading is not zero, turn the right adjuster until the
reading is zero. Moving the slot to the right makes the gauge go
towards 60 psi, to the left, the other way. Wait at least two
minutes
After you have zeroed it, apply 60 psi and recheck the reading.
To precisely calibrate the gauge and make the readings REPEATABLE
is virtually impossible. Some may wish to tap the gauge to help
readings stabilize. If you get it to properly read zero psi and
then read within 5 lbs at 60 psi count the count as done! Another
problem with old gauges is that they may move very slowly as they
approach zero and or 60 psi. We live with a lot of worse things!
Tell me how it works out for you. Dennis–
Dennnis
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