liquid level sensor

Hi all.
I'm needing to find some liquid level sensors. They will be measuring diesel in tanks. I'd like them to have both 4-20ma continuous as well as relay for high level. I need approximately 4ft range and 10ft range. The temperature spec for the 4ft needs to be -40F-125F. Anyone have any favorites?

I've used the ultrasonic sensors from Automation Direct before and really like them, however the temperature range is not what I need.

Thanks

Vega and Endress+hauser have good models also.