Problem with an oil filled fuel pressure gauge.

[Paranoid]

I'm using a Holley "oil filled" fuel pressure. The gauge wasn't "zero-ed" when I got it and the instructions said to tilt it while in the 12 o'clock position and open the rubber stopper at the back until the gauge read "zero."

Well, I did, but now the oil level has dropped to almost half empty. Wheras before, There was just a little air buble.

Can I fill the gauge up? What type of oil is in the gauge? Mineral oil?

Thanks
Len

 

[1BAD69]

Len,

I had one of those for awhile but junked it...kept giving me different readings...i got an autometre fuel pressure gauge and mounted it under the cowl of the L-88 hood along with the temp and oil press....this way i can see what it is doing while i am driving and not when it is idling...