> Firstly I am having the problem with the oil pressure light/buzzer coming
> on randomly.  I've read alot about this problem and I have gone back to the
> guy I bought the van from to find out what he knew.  He said he had replaced
> both high and low sensors and the sending unit, and since he is my mechanic
> I had him verify the wiring.

What weight oil are you using?  Most run 20/50 or 15/50 if running synthetic

Second is a set of tires.  I bought it with some incorrect tires on it and I
> really want to get the right ones before something drastic happens.  I see
> everyone saying these Yokohama Y356 and Y370 tires are great and I am going
> to get a set of them,

Check out the reviews at roadhaus.com for more tire info.  IIRC not all
reports on the Yokohama have been that good.

  I've been ok for the last 2 or 3 weeks, except I am still hearing a
> buzzing noise come from the fuel pump when I first start up.

RE: buzzing fuel pump-that's normal, you should hear it for a few seconds
when turning on the ignition.

> Last question is about a new set of locks.  The lock cylendar on my rear
> gate is damaged so it no longer takes a key to unlock it (anything flat can
> turn the lock).  I'd like to get a completely new set, ignition, doors, gas
> cap, and rear gate. Anyone know where to get this?

Any competent lock smith/lock shop should be able to fix that.  Check the
archives for info on removing the lock cylinder.