I studied the attached oil pressure gage diagram and would like a clarification if you understand it. The way I understand it, it shows a pink wire coming from the fuse box, this must be power, and a pink and black wire heading to the sending unit. My sending unit has always had a black wire coming off the top. So I assume that this black wire is the same as the pink and black wire.
Does that make sense? I don't want to fry the gage if it's not already bad
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Yes, you are reading it correctly. Also make sure the pressure sending unit is grounded. Without the ground it will be an open circuit and not function.
John
#3590
sometimes a thread sealer or tape can keep the sending unit from grounding, so I tested it by adding a temporary ground wire. Still got nothing. I pulled the gage and will test it close to the sending unit. If that doesn't work give me a signal, I'll get another sending unit before going for a new or rebuilt gage. Have any of you tested a gage by some other means?
You can test the gauge if you have a variable resistor, or just a couple resistors and clip leads…
If you search here,there have been a couple posts about the pressure vs. resistance curves of various senders.
I’ll look for one…
Rocky
