Oil pressure light

[Topline]

I was finally able to fire up my 400, after my first engine build. All went well, fired up on the first crank and all is great. I used an aftermarket oil pressure guage on the initial start up and pressure built like it should. I am looking for a quick lesson on the pressure light. Should it turn on momentarily with the ignition? I'm not getting anything? Thanks in advance for the education!

 

[Billccm]

Ground the sender and make sure the light comes on. If not check the bulb and socket.
Still doesn't light look at wiring.

 

[Topline]

Thank you Billccm, I tested the light on the cluster when I replaced them with LEDs. So I know that half checks out. Does the sender unit ground out with low pressure thus grounding the circuit and tripping the light? I am trying to understand how the sending unit functions as well. How would I ground it to test it?

 

[Billccm]

Take a piece of wire, clip leads, etc and short the top of the sender and wire to ground. I'm going to assume your sender is good and you have a wiring issue.

 

[Topline]

I'll try that. I also realized that I used rtv on the threads and it may not be grounded. I'm also considering going with a mechanical oil and water guages.

 

[Topline]

I finally figured out my oil light. A simple mistake. When I had my instrument cluster out I replaced all the lights with LEDs. Then I bench tested them all to make sure that they worked. I put a positive feedback to the light like the rest. Not aware that the pin for the light is actually the switch grounding the circuit. I simply had to turn the led 180 degrees in the base. But I am curious if I could put a t in at the block and run a mechanical guage with the light?