Oil pressure gauge?

[Splatterific]

My oil pressure gauge keyed off reads 0 turn the key on not running it reads 40psi. That would be the sender I'd imagine. Is there only one sender or us there also an oil switch too ?

[4.3LXJ]

Only one sender for the guage

[Splatterific]

Is it the one above the oil filter. Checking in eBay and there calling it sender/switch. I know sine engines have a separate switch for a boil psi light in the dash other then the gauge.

[4.3LXJ]

Yes, it is a sender if you have a gauge