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The larger device is a vacuum actuated exhaust diverter. Possibly it's to allow the engine to come up to temperature faster.

The smallest single blade sensor is for one of your high temp warning lights and mounts probably in the intake near the thermostat housing. It will be a blind hole and the sensor is normally Aluminum.

One of the other "bulbed" sensors is for another high temp warning light. The other might be the ground delay for the HVAC blower motor.

The three prong is likely an oil sending unit.

Take your photo and add some numbers to it so people can just call them out by number..

Scott

 

What 79 eldo said "The smallest single blade sensor is for one of your high temp warning lights and mounts probably in the intake near the thermostat housing. It will be a blind hole and the sensor is normally Aluminum. " is true for the left drivers side head. But there is one in the right head , that looks the same, but is not. The one on the right is to keep the blower from going on ,until warm ,when heat is called for. But is bypassed for A/C and defrost.

 

Are their any other sensors on the engine besides those 5?

 

You should be able to go thru this link and find sensors needed for engine.

1976 CADILLAC ELDORADO 8.2L 500cid V8 Electrical | RockAuto

 

Folks;
3 blade/prong oil pressure sensor?????
All of the Cadillac oil pressure sensors I've changed have 1 prong. What are the other 2 prongs for?
Does the 1976 Eldorado have an oil pressure dash gauge vs an idiot light?

King

 

Folks;
3 blade/prong oil pressure sensor?????
All of the Cadillac oil pressure sensors I've changed have 1 prong. What are the other 2 prongs for?
Does the 1976 Eldorado have an oil pressure dash gauge vs an idiot light?

King

Looks like may depend on vehicle options.
1976 CADILLAC ELDORADO 8.2L 500cid V8 Oil Pressure Sender / Switch | RockAuto

 

Eldo King On the 3 prong oil pressure sensors , I have just run into this on the 76 I was working on, The other two prongs are for the electic choke . So it won't open the choke if the key is on and not running..

 

Do you know what the other 2 sensors are and maybe where I can buy these sensors at?

 

For the warning lights, when I was searching, the option was NOS only but there seemed to be quite a few available. The trick was really knowing exactly the PN you need. There are even 2 sensors which look almost identical, but one has a coarse thread and the other has a fine thread. They are both Aluminum sensors which thread into blind holes. I only found 2 similar PNs but there could be more. If there are only 2 we could probably determine the PN by looking closer at the thread pitch. The photo above isn't clear enough for me to be certain. If the OE sensor still exists, and that wasn't a photo from a different car, possibly the OE sensor still works... Mine did and it clean-up nicely.