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PostPosted: Fri Aug 16, 2019 7:53 pm 
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TBI Slant 6
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Joined: Thu Apr 07, 2016 9:15 am
Posts: 193
Location: Rhode Island
Car Model: 1968 Barracuda - Fastback
I'm (temporarily) running a 1985 peanut head cylinder head on a 1968 barracuda. The coolant temperature sensor is much larger on the '85 head then it is on the '68. Does anyone know what part number I need for the correct temperature sensor that will work with the '68 Rallye gauges (non idiot light)? This could be a very obvious question, but I'm stumped.
-Chris

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PostPosted: Fri Aug 16, 2019 8:37 pm 
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Try this sender with this connector (yellow wire should go to your existing temp sender wire, black to ground).

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PostPosted: Sat Aug 17, 2019 6:58 am 
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TBI Slant 6
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Joined: Thu Apr 07, 2016 9:15 am
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Location: Rhode Island
Car Model: 1968 Barracuda - Fastback
I'll go that route if I have to Dan (TY for the quick reply!!!), but am hoping to find one that will appear more OE for the application - perhaps a one-wire solution.

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'68 Barracuda - taking advice on increasing street torque, power, & road handling. Click To See It


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PostPosted: Sat Aug 17, 2019 9:09 am 
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Joined: Mon Jan 12, 2015 5:55 am
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Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I
Why not use a brass adapter and the 68 sender. Or, just plug the big hole and tap a new one for the 68 sender.

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PostPosted: Sat Aug 17, 2019 11:50 am 
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TBI Slant 6
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Joined: Thu Apr 07, 2016 9:15 am
Posts: 193
Location: Rhode Island
Car Model: 1968 Barracuda - Fastback
Great idea @badvert65 would you have a part number or link for that?

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'68 Barracuda - taking advice on increasing street torque, power, & road handling. Click To See It


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PostPosted: Sat Aug 17, 2019 1:42 pm 
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EFI Slant 6

Joined: Sat Mar 19, 2016 7:25 pm
Posts: 286
Location: SW PA
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You need a pipe thread bushing, I'll be honest, don't recall what size they are, but maybe 1/4-1/8 NPT reducing bushing......whatever, they are not an uncommon item............


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PostPosted: Sat Aug 17, 2019 4:30 pm 
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Joined: Wed Oct 23, 2002 7:57 pm
Posts: 7455
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Hardware store item.

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PostPosted: Sat Aug 17, 2019 7:00 pm 
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Joined: Wed Nov 06, 2002 1:57 pm
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Location: Everett, WA
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Your '68 sensor can go in the npt threaded hole above #1 exhaust port. The 2 larger npt threaded holes next to the thermometer can be blocked.


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PostPosted: Sun Aug 18, 2019 3:28 pm 
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TBI Slant 6
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Joined: Thu Apr 07, 2016 9:15 am
Posts: 193
Location: Rhode Island
Car Model: 1968 Barracuda - Fastback
@badvert65, the bushing idea was genius, I certainly wasn't seeing the forest through the trees. So as to help the next person who runs into this situation - the brass reducer bushing size that works is 3/8" M X 1/8" F, and was as close as my Ace Hardware Store for cheap. Thanks to all! -Chris

@kesteb, the thread pitch isn't a match, couldn't do that.

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PostPosted: Mon Aug 19, 2019 6:56 pm 
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Funny, a 1/8-27 NPT tap works in that hole for every head that I have. So I don't see why yours would be different. But I am glad that you found a solution.


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PostPosted: Mon Aug 19, 2019 10:10 pm 
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Joined: Thu Oct 17, 2002 7:27 pm
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Location: Park Forest, Illinoisy
Car Model: 68 Valiant
IIRC, I ran into the thread pitch thing on one of my heads, and it was straight thread, not pipe.

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