Rally dash oil pressure gauge issue.
Yes 70 ohms should read low on the gage.
I've plotted some of this out on a graph. Ohms is the side axis.
Its a work in progress...
On the graph is two sets of info.:
1 Engine running, dash gage in response to known resistors, along with specifications that have been kindly shared from repair manuals.
2 Sender resistance in response to my car's old NAPA - Echlin oil pressure sender.
If that makes it confusing, I can digitally erase that later.
It's my opinion that that parts suppliers began substituting because they did not have the correctly calibrated ones.
Based on the test of the gage in my '67 I also think the spec I have from the '85AMC Jeep SJ shop manual is probably slightly different than Chrysler's 1960s spec.
Oil Pressure Gage and Sending Unit Revisited
Sorry I didn't see your post before.
Yes 70 ohms should read low on the gage.
I've plotted some of this out on a graph. Ohms is the side axis.
Its a work in progress...
On the graph is two sets of info.:
1 Engine running, dash gage in response to known resistors, along with specifications that have been kindly shared from repair manuals.
2 Sender resistance in response to my car's old NAPA - Echlin oil pressure sender.
If that makes it confusing, I can digitally erase that later.
It's my opinion that that parts suppliers began substituting because they did not have the correctly calibrated ones.
Based on the test of the gage in my '67 I also think the spec I have from the '85AMC Jeep SJ shop manual is probably slightly different than Chrysler's 1960s spec.
Oil Pressure Gage and Sending Unit Revisited
