Pressure sending unit for VDO gauge?

My Torino came with VDO gauges installed by the previous owner (Temp, volts, oil pressure). Since it came with no engine, it came with no sending unit. The line going to the sending unit appears to be a tube, not an electrical connection, but all of the senders I can find on VDO's site and Summit are electrical senders. Can anyone point me to the right unit, or am I out of luck?
[addsig]

Copper Tubing
6ft., 1/8" diameter. For mechanical pressure gauges (except fuel or brake pressure gauges).
3224

Try this for your oil gauge (auto meter part#) tube goes from oil galley to back of gauge.

I think a light just went on. The tubing is there. Is there no sending unit for a mechanical gauge? Do I just put a fitting where the factory sending unit sits?
[addsig]

Just moving it to the top.
[addsig]

for the oil gauge just remove the factory electric sending unit and adapt the tube to this hole you need a compression fitting for the tube.