Before you go riding around on those Saturn wheels, PLEASE read this thread:
http://www.toyotanation.com/forum/t15167-1.html. You need proper hubcentric rings for them and make sure the offset is right, otherwise the weight of your car will rest on your lug nuts and they will bend. Wheels are a tricky subject.
Anyway, as far as the tach goes, you can probably get an instrument cluster with a tach from a Corolla at a junkyard. Use
www.car-part.com to find junkyards near you that have the instrument cluster with the tach. Before going to a junkyard that has the part, however, call ahead and make sure that the cluster they have has a tach. I once drove 1.5 hours to find that they had an inventory error and had only clusters without tachs.
All the wires plug in as they should, it's essentially a plug-and-play deal. The only problem is that you will have different mileage on the odometer. Check my cardomain page if you want (link in my sig), as I did this swap.
Not sure about DRL, or why you would want to disable them, but my guess is you just need to remove a fuse somewhere or cut a wire, probably the latter.