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Oil gauge issue
Hello everyone. I have had an issue with the oil gauge FF supplied. At first it stoped working when I came to a traffic light and the oil pressure dropped below 25psi. Then I started to bounce like it was possessed and now it will only work if the pressure is above 75psi. Is it the gauge or the sending unit? I am running a SBC old school gen 1. I installed the sending unit jus above the oil filter on the drivers side.
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Have you checked for loose connections?
The sender works on changing resistance as the pressure changes.
If you have a few resistors you could use clip leads to connect them to the sender wire and ground to see if the gauge is working.
75 PSI is pretty high for a SBC. My last one only ran around 50PSI (hot) at speed.
Last edited by JimLev; 09-09-2018 at 10:59 AM.
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Senior Member
I have built a bunch of small block chevys (as well as the 400ci in my 33). I have always mounted the sending unit next to the distributor on the block and thay all worked fine.
TomH33
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Thanks guys. Tom do you have a photo of the location. It was never 75psi before. I do have a high volume pump on it.
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Senior Member
Here is the best photoI can do. You can use 1/8"NPT tubing or 45 degree fittings to make it fit under the distributor. _DSC0109.jpg_DSC0110.jpg
Have more questions, just ask.
TomH33
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Thanks Tom I am going to try that.
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I had one go bad. And when I worked on replacing it I foolishly used thread sealer to ensure it didn't leak. What I accomplished was to avoid the ground necessary to make it work. Here are some shots of mine. I like the angled installation Tom did but mine had a short piece coming up form the block then two 90's to offset it. Has worked pretty good. Bottom line is what Tom says.
Holley-5.jpgHolley-7.jpgHolley-9.jpgIMG_1193.jpgIMG_1194.jpgIMG_1205.jpgIMG_1204.jpg
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One thing I noticed with these gauges is that even if you use the push on connectors on the gauge you have to make sure the nuts are tight on the screw posts.
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