Let me check my numbers!
There are three variants of V6 crank sensor and they are not electrically interchangeable.
The earliest has a connector with square sides. This is GM 90492006 / Opel Kat 62-38-333. The Kat number might be stamped on the head.
Then there are two sensors with oval sides. The first of these is 540Ω. This might be a Delphi part and is GM 90492061 / Opel Kat 62-38-126. This part was apparently only used on 2.5 V6. The Kat number might be stamped on the sensor.
And lastly there is a a 850Ω<>900Ω part. This has a Bosch logo on the sensor. It is GM part 90540743 / Opel Kat 12-34-740. It can also be stamped 9049182 which is a factory only number.. This variant is found on later 2.5&3.0 and all 2.6/3.2. The Bosch part number is 0 261 210 131 and this might be stamped on the head of the sensor from factory. Most V6s have this sensor.
So look carefully at the sensor that came off the car. You want one that matches exactly.