Oxygen Sensor, For the California Folks Options

[gfg3]

I have a '75 1.8 FI car that originated in California. This car originally had an O2 sensor, but now it doesn't. I'm looking to replace that O2 sensor. I've been told that the O2 sensor hooked into some sort of relay which then ran back to the computer. First, is that correct? Second, does anyone have a photo of the O2 sensor hookup from the exhaust all the way to the computer? If there really is a relay in this scheme I could also use a picture or description of that relay too. Once I figure out what I'm looking for I'll try to find the parts. Thanks.

George

[PancakePorsche]

75/76 California cars:
The relay in the trunk is temp control relay which reads the thermocouple in the thermal reactor. It usually will only trip if spark plug fouls or MPS failure which puts excessive raw fuel into the reactor causing it to overheat therefor damaging it or drastically shortening it's life.

For further protection it also has fuel cutout rev limiter instead of ignition (sister board on battery tray), and decel fuel cutout in the ECU below 2K rpm with full off throttle. Very annoying in slow traffic.