SOLVED: 911 Oil pressure sender, Can't figure out why it won't work - bad sender(s) Options

[nditiz1]

So I have a distribution block on my engine. A grease gun hose goes from the standard top opening to this block. The block has a large hole and a small hole. The small hole has the standard idiot sensor. This works fine as the light goes off in the dash. A 911 sender is screwed into the large hole. I have a wire going to the gauge in my dash. If I ground the wire to the engine, the gauge pegs at 5 bar/above. The sender is a 0-5bar, the gauge is a 5 bar. What am I missing here? I have even swapped the sender and still I am not getting a reading.

[nditiz1]

In theory I should be able to blow compressed air into the non working sender and get some kind of resistance correct?

Edit: IF it is working as it should

[Superhawk996]

In theory I should be able to blow compressed air into the non working sender and get some kind of resistance correct?

Edit: IF it is working as it should

Yes but with a caveat - you’ll probably need an air nozzle with a rubber taper tip to get somewhat of a seal. I’ve done it in past with rubber nozzle and it worked OK cant vouch for metal tip air nozzles.

The other thing is an analog multimeter will work better. A digital auto-range may not be able to adjust to the varying resistance fast enough to give you a reading very well. Set the digital multimeter to a fixed range (assuming yours can) and it should read resistance better.