Temp sending unit - Pontiac GTO Forum
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post #1 of 4 (permalink) Old 05-08-2015, 05:17 PM Thread Starter
 
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Temp sending unit

Which temp sensor do i need for a 72 lemans 400ci. with idiot light.
Im getting mixed advice from everyones catalogs. I cant figure out if i need the single prong button style or the one with 2 terminals.

Thanks.

1972 Lemans Luxury 421/400

1968 Chevy Panel Truck 327/3 speed
62xxx original miles.
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post #2 of 4 (permalink) Old 05-08-2015, 05:45 PM
 
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look at the wire harness under the hood n see what type of connector it has. some old style sending units come with a kit to change the terminal style.
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post #3 of 4 (permalink) Old 05-08-2015, 06:33 PM Thread Starter
 
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Motors been swapped at some point... Vin says it came with a 350. The connector is cut off and was taped up... It is a green wire. If I ground it, the idiot light comes on.

1972 Lemans Luxury 421/400

1968 Chevy Panel Truck 327/3 speed
62xxx original miles.
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post #4 of 4 (permalink) Old 05-09-2015, 06:57 PM
 
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For 72 models, the water temp temperature sending unit was relocated from the front of the intake manifold water crossover to a passage in the outer cylinder head. Green wire is correct. Believe the temp sending unit used a side slide in type sending unit, will ck one of my '72 LeMans partscars and post back.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring

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