As Will said. Just be aware that if you drill and tap the stock cover that it will crack after a few track days.
The aftermarket ones from Lingenfelter, Mast Motorsports, ect are great. But I would personally get a dual outlet one, and then hook stainless -3 lines to them and remote mount the senders with adel clamps on the firewall. You will want to hook the oil pressure to this location as well since the accusump line wont ever see a pressure drop.
For the water temp sender I would get a metric thread to -3 adapter and install it into the factory cylinder head location. That way you get actual coolant temp readings.