Chrysler Repair: Voyager oil pressure & ABS code reset, oil pressure gauge, plymouth grand voyager

Question
Hi Roland, I have Plymouth Grand Voyager 3.3SE (1997). It recently had oil changed (10W-30) and oil filter and spark plugs replaced. After the change, when the car is driven for about 3-4 minutes, the oil pressure light and a chime come on. When the car is stationary and the engine running (even for more than an hour) it never happens. The oil level is OK, there are no leaks and the oil is still nice and clean. I have noticed that somehow the knock sensor broke off (I have already ordered a new one) – is there any possible connection? Also, where can I buy the oil pressure gauge for this vehicle?
Finally I also need to replace wheel speed sensors, since the ABS light is on and the code readout indicated the faulty sensors - will the light reset itself after replacement of the sensors, or do I just disconnect the battery for a while? Many thanks for your help. Kind regards, Boris.  

Answer
Hi Boris,
If you mean the oil pressure "sender" (that operates the warning light) that should be available at a dealer or a professional parts store. Is it possible that the oil that was used was 5W-30? If not, then try a new sender. It is located next to the oil filter. I don't believe the knock sensor has anything to do with the oil pressure sender, unless both were damaged simultaneously.
The abs fault codes will reset if they are no longer relevant, but only after driving 3500 miles. They can also be erased with the Chrysler Diagnostic Readout Box III or equivalent if you don't want to wait that long. Disconnecting the battery won't erase them.
Roland