[grd777]

looks like a sending unit on the pass side . i also have one on the drivers side

[OZZIEVILLE 67 2 door]

I'll have the first guess that its a water temperature sensor, John L.

Sent from my SM-T585 using Tapatalk

[grd777]

Originally Posted by OZZIEVILLE 67 2 door

I'll have the first guess that its a water temperature sensor, John L.

Sent from my SM-T585 using Tapatalk

have this on the driver side

[OZZIEVILLE 67 2 door]

Now that 2nd photo looks like an oil pressure sensor, just my guess , I'm sure I will be corrected if wrong
John L.

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[fbody_mike]

The first Pic is a water temp switch, for a warning light or emission devices. Maybe TCC since this is a 72.
The second Pic is a water temp sender. This is for the gauge in the dash.

[necdb3]

Originally Posted by grd777

looks like a sending unit on the pass side . i also have one on the drivers side

It is for the Transmission controlled spark(TCS) system. Are you going to use that system? You will have a plug in your harness for it.

[grd777]

Originally Posted by necdb3

It is for the Transmission controlled spark(TCS) system. Are you going to use that system? You will have a plug in your harness for it.

not sure yet is that for a auto tranny . i have converted to 4 speed

[necdb3]

Originally Posted by grd777

not sure yet is that for a auto tranny . i have converted to 4 speed

Both would have it from the factory. the component that changes would only be at the trans.

[grd777]

Originally Posted by necdb3

Both would have it from the factory. the component that changes would only be at the trans.

ok so the factory installed both ,but only used one depending on the car you ordered

["QUICK-SILVER"]

Originally Posted by grd777

ok so the factory installed both ,but only used one depending on the car you ordered

Auto and stick both had switches that worked with the extra temp switch in the head. Along with a handful more gadgets, wires, vac hoses.. that controlled vacuum going to the vacuum advance on the distributor.

This would be an all or none deal for me.

Clay

[necdb3]

Automatic had a switch that would trip at 38mph, a manual had a switch for 4th gear. Being you switched to a 4spd. Does the 4spd you got have a switch in the side cover where the shift levers attach?

[grd777]

Originally Posted by necdb3

Automatic had a switch that would trip at 38mph, a manual had a switch for 4th gear. Being you switched to a 4spd. Does the 4spd you got have a switch in the side cover where the shift levers attach?

will check and let u know

[grd777]

Originally Posted by necdb3

Automatic had a switch that would trip at 38mph, a manual had a switch for 4th gear. Being you switched to a 4spd. Does the 4spd you got have a switch in the side cover where the shift levers attach?

is this what you mean

[necdb3]

Originally Posted by grd777

is this what you mean

Yes, the harness should connect to that switch. That switch should be grounded unless the transmission is placed into 4th gear.

[Formulabruce]

TCS, Temp controlled Spark. You do NOT want or need this working on your car. More things to go wrong and it was not designed to work with fuel that burns hotter, and advances that are more advanced than stock.

[grd777]

Originally Posted by Formulabruce

TCS, Temp controlled Spark. You do NOT want or need this working on your car. More things to go wrong and it was not designed to work with fuel that burns hotter, and advances that are more advanced than stock.

should i just plug the hole in the block/head then . or install the sending unit and not hook it up

[necdb3]

Originally Posted by Formulabruce

TCS, Temp controlled Spark. You do NOT want or need this working on your car. More things to go wrong and it was not designed to work with fuel that burns hotter, and advances that are more advanced than stock.

It doesn't allow additional advance, it does just the opposite. It removes advance by turning the vac advance off unless conditions are met. If the system is disconnected, it will leave the vac advance working all the time. That's not a bad thing, but if your goal is to have the car work as it did from the factory (to factory specs) you would hook it up. It is an emission control device.

Saying that, the engine will run better with it disconnected. Disconnecting it from any electrical connection will turn the system off.

[grd777]

Originally Posted by necdb3

It doesn't allow additional advance, it does just the opposite. It removes advance by turning the vac advance off unless conditions are met. If the system is disconnected, it will leave the vac advance working all the time. That's not a bad thing, but if your goal is to have the car work as it did from the factory (to factory specs) you would hook it up. It is an emission control device.

Saying that, the engine will run better with it disconnected. Disconnecting it from any electrical connection will turn the system off.

is the one for a 72 a 3 prong or a 2 prong

[necdb3]

Originally Posted by grd777

is the one for a 72 a 3 prong or a 2 prong

3 but only 2 prongs used

[grd777]

Originally Posted by necdb3

3 but only 2 prongs used

thank you for your help on this