Oil pressure light isn't working

[Upshotknothole]

So as I'm going to be working on the bike before restoring it to full fairings, I figure now's the time to fix my non working oil pressure light. Already swapped the bulb and the gauges/front sub harness. I'm guessing it's the switch itself, any way to test it while I have the have the oil drained from the bike? Are they the same on all the oil cooled bikes? Thanks

[Upshotknothole]

Checked and looks like Suzuki used the same part for at least 40 years now, any idea how to check it before I replace it?

[fab]

short the wire at the sender end and see if the light comes on.

[Upshotknothole]

16 minutes ago, fab said:

short the wire at the sender end and see if the light comes on.

Thanks!

[TonyGee]

as fab says just ground the wire with the ignition on. 

[Gixer1460]

And they are real simple devices - contact plate and spring. Could be just a dirty contact - they are 40+ years old after all!

[Upshotknothole]

10 hours ago, Gixer1460 said:

And they are real simple devices - contact plate and spring. Could be just a dirty contact - they are 40+ years old after all!

Thanks, I need to do an oil change on it later this week and I'll pull it apart while it's drained.