The VDO gauge replacements are the Ocean Series. The Temperature sender is made by VDO. Part No. 803/1/11. It is out of production but the supplier still has a handful left. I suggest taking out the existing sender and look on the sides. The part No should match.
Its a 5/8 inch thread. Apparently this is an odd size? and the primary reason they quit making them.
The Tempt gauge product No 3101103 runs around 50 bucks.
I have not had to replace the oil pressure.
Suggest calling VDO or a local VDO gauge supplier and ask. I imagine the oil pressure also has a VDO sending unit.
The ocean Line series have slightly different wire configuration on the gauges but the old wire and fittings will work. The instructions are pretty clear, and the old gauges are marked (pos, neg, sending unit (G) and etc.
I have a great supplier here in Norfolk VA whose name I will pass on if you need it. They were recommended by the Factory rep and have been great to work with.