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EFV-8 Club Forum / General Ford Discussion / Temp sending units

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Discussion Topic: Temp sending units -- page: 1 2

bgd8953

04-17-2026 @ 3:21 PM

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Thanks

carcrazy

04-16-2026 @ 1:38 PM

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If you want to use your original electrical temperature gauge to monitor the coolant temperature in both heads with a 12V system, you can obtain the proper parts to make that happen with these components.

Dennis Carpenter has the temperature sending units - Right Hand #8A-10884 & Left Hand #8A-10990

Fifth Avenue has the Runtz Transistorized Voltage Reducer #95415G

https://fifthaveinternetgarage.com/electrical_parts.php

jamesmundstock

04-16-2026 @ 9:47 AM

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I also have a ‘47 with the 59 AB with 12 volt negative ground. The two sending units connect together then one wire from the drivers sending unit to the factory in-dash gauge. You need voltage reducer at the gauge connection. Mine works perfect and is accurate.

JayChicago

04-16-2026 @ 8:36 AM

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From original post: "...12 volt, it has an auxiliary temp gauge, and only the left side is connected to the gauge"

I take that to mean a modern aftermarket gauge. If so, it has its own sender which works on a different principal and cannot be made to work with the original sender.

However, the rest of the original gauge cluster probably has a 12-to-6 volt feed, so the original gauge should be able to work. Need to use an original sender on the right bank.

bgd8953

04-16-2026 @ 2:55 AM

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Thanks, much appreciated

51504bat

04-15-2026 @ 7:03 PM

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Wiring Schematic

Left Sender (Driver): Wire to Position 1 on the 3-position switch.
Right Sender (Passenger): Wire to Position 3 (other outer position) on the switch.
Center Switch Terminal: Wire to the Gauge "S" (Signal) post.
Gauge "I" (Ignition) Post: Connect to a switched 12V or 6V source (depending on system voltage).
Gauge Ground: Ensure the gauge case is grounded.
Switch Operation: Position 1 = Left Temp, Center = OFF, Position 3 = Right Temp.

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bgd8953

04-15-2026 @ 6:43 PM

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Good options, thanks

bgd8953

04-15-2026 @ 6:42 PM

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I don't believe they can be connected together, it would make life simple though.

51504bat

04-15-2026 @ 5:34 PM

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Option one: add a second gauge each with it's own sender.
Option two: an on-off-on 3 position toggle switch to allow you to switch between senders using one gauge.

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nelsb01

04-15-2026 @ 4:39 PM

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The first question is...... with your 12-volt system can the individual sending units be connected to each other?

Originally as a 6-volt system, the two were connected, and then the sending unit with the two tabs on it was connected to the temperature gauge in the dash.

I'm a 6-volt guy and am not sure how they should be connected in a 12-volt setup, but I am sure someone who knows will be able to answer.

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