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Hammer and a torch
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1,254 Posts
If its the 400 Pontiac engine then the tach signal comes from the HEI distributor... Its the connection right next to the large red ignition wire... The temp gauge if I remember was in the head like a SBC...? Dont remember for sure...? The oil sending unit was right by the filter/housing...

Some of the Pontiac guys might have more insight or even pic`s...?
 

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floppers forever
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788 Posts
if hei it's like bumpstick said next to the red lead on the distributor cap.otherwise it's the neg.- on the coil.
temp. switch shoud be on the driverside head,many people moved it to the intake.
oil pressure will be on the back of the block.
 
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