Does anyone use an E34 M5 oil pressure sender with their VDO gauges. I've got M5 pressure and temp senders installed on my 98 M3, but my oil pressure gauge isn't working.

I sent back my oil pressure gauge to BMP, but they tell me that they only work with with VDO senders. However, my oil temp gauge seems to work. VDO tells me that their gauges only work with senders that put out 10-180 or 240-33 ohms. Anybody have a clue as to the ohm output on M5 senders?

Getting a new VDO sender is the obvious answer, but I first want to see if I can keep my M5 senders. Any insight would be appreciated.