Oil Pressure Sender

[drolston]

I have been through three reproduction 50# oil pressure senders on my '41. One failed, the next one showed 15# with the engine off; a second replacement worked okay for a while, now shows 20# with the engine off. Where can I find an original type oil pressure sender. I would even use and 80# unit, knowing that the calibration is way off, but will show a true zero pressure.