I actually just bought the D-Gauges from Panda Pro. You can call them up and get them to combine the shipping from you. I had to get those since the prices were so cheap (relatively). I think they are discontinued, so if you want them you should get them while they are still available.
I bought two temperature gauges and the oil pressure gauge.
Mpower: How big is the Defi oil pressure sending unit? Is it tiny like the Greddy/Omori type senders?