Temperature sensor modification - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**A1971Blazer** · 01-06-2017, 10:33 AM

I had offered to try and modify a sender from ½ NPT to ⅜ NPT for a member but he never followed thru...last week I got a PM from another member wanting to try one.

He sent me this one ACDelco....... G1852
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I re-machined it on one of my CNC lathes...it looks like it will work just fine...
sending it back for install....we'll see....?
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**mongocanfly** · 01-06-2017, 10:41 AM

That's purty..that's a great idea..you should do some of these with metric threads to fit the LS heads..should be a fair demand for those...would beat drilling and tapping the head...

**truckster** · 01-06-2017, 01:23 PM

What would the cost for something like that be?

**mongocanfly** · 01-06-2017, 03:01 PM

The hole size in the ls head is 12x1.25...that would be to small to mod the sensor...it would have to be 12mm (.472) major od with 10.466mm (.412) minor od..

**A1971Blazer** · 01-06-2017, 03:04 PM

Quote:

Originally Posted by mongocanfly

The hole size in the ls head is 12x1.25...that would be to small to mod the sensor...it would have to be 12mm (.472) major od with 10.466mm (.412) minor od..

I'll see if I have an old one to cut apart so I can find out exactly how much material it has in that area...you're correct....M12 X 1.25 would cut it down pretty small...

storm9c1 · 01-08-2017, 08:43 PM

I've seen other threads about folks doing this in the past. Great to see someone doing it again. I've found 2 VDO sensors that are very close to stock (electrically) in 1/8" NPT and come with a 3/8" donut adapter that works fairly well (there's an old thread on here about it). But nothing beats the stock sensors when paired up with the stock gauges. I'll definitely keep this in mind if I want to swap back to a stock sensor. This is clearly the best option.

**truckster** · 03-08-2017, 11:23 PM

A1971Blazer,

Have you heard back on the install? I'm getting ready to put my Vortec together. I noticed that your threads look a lot nicer than the factory threads, so I imagine it was a good fit. Any concern with weakening the brass, or is there enough meat there that it's not a concern?

By the way, do you live up by the Cherokee National Forest? I have family that lives just the other side of the mountains, between Blowing Rock and Lenoir, NC. It's definitely what I would call God's country.

**A1971Blazer** · 03-09-2017, 08:13 AM

Quote:

Originally Posted by truckster

A1971Blazer,

Have you heard back on the install? I'm getting ready to put my Vortec together. I noticed that your threads look a lot nicer than the factory threads, so I imagine it was a good fit. Any concern with weakening the brass, or is there enough meat there that it's not a concern?

By the way, do you live up by the Cherokee National Forest? I have family that lives just the other side of the mountains, between Blowing Rock and Lenoir, NC. It's definitely what I would call God's country.

Truckster.....as a matter of fact I got a PM this morning from the member that I did that first one for.....he finally got it installed and said it worked just fine.....
There is enough material on the sensor for the 3/8 NPT.......but that's the limit.
I cut an old one apart to verify...
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I live near the Cherokee NF but I live on the Tennessee side.....about 30 minutes from the infamous "Tail of the Dragon" highway 129 through Deals Gap into North Carolina.

If you want one modified...I'd be happy to do it.....

**truckster** · 03-09-2017, 12:43 PM

That looks really good. I'm sending you a PM.

Mike (Asheville) · 10-15-2017, 04:01 PM

I can attest both to Whit's excellent work and the functionality of that Delco part.

It's so nice to know the temp again.

**Captainfab** · 10-15-2017, 11:13 PM

Saving for later.......

**truckster** · 10-16-2017, 10:38 PM

I got mine from Whit. Nice guy and beautiful work.

**A1971Blazer** · 10-18-2017, 07:39 AM

Thanks for the kind words guys....this modification is easy for me to do...I'm happy to help fellow members to solve the dilemma of getting the temp gauge working properly..
For me......I like for everything to work like it should...

min · 11-04-2017, 05:02 PM

I would be interested in one of these. Need the sending unit.

**A1971Blazer** · 11-13-2017, 10:27 AM

Quote:

Originally Posted by min

I would be interested in one of these. Need the sending unit.

I have 4 on order right now...they are AC Delco #G1852
the price will be $39.00 for the sensor, modified to 3/8 NPT....and shipped to you...
PM me if you want to reserve one of them....thanks!

**A1971Blazer** · 11-16-2017, 04:16 PM

OK....I got them and modded for the ⅜-NPT....
2 are spoken for already.....(PM sent)...will ship as soon as paypal payment is received...thanks!
2 more available for immediate shipping

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**Captainfab** · 11-20-2017, 12:11 AM

I will take both of the senders you have left. Send me a PM with your PayPal info and I will send payment. Thanks.

**A1971Blazer** · 11-20-2017, 06:46 PM

All 4 shipped today....you should see them Friday or Saturday...thanks again
Anyone else interested....let me know.....I'll get some more going

**A1971Blazer** · 02-07-2018, 04:34 PM

I'm still doing these for anyone needing a modified sensor....it's not a money maker for me.......just a favor for members...

**53burb** · 02-10-2018, 05:00 AM

are these for SBC Vortec heads in a 67-72? Are they the same for BBC Vortec heads?

**A1971Blazer** · 02-10-2018, 09:47 AM

Quote:

Originally Posted by 53burb

are these for SBC Vortec heads in a 67-72? Are they the same for BBC Vortec heads?

I've been doing these primarily for guys that are running Vortec heads on small blocks....and want to make the factory temp gauge read correctly

There were several lengthy discussions about trying to find a sensor that would fit and read the correct temperature.....

I discovered that once upon a time, there was a member that was doing the modification, but for some reason, is no longer doing so.
That's when I offered to do them...

As for it fitting the BBC Vortec heads....I can't give you a definite answer.
What is the engine designation number/code and year...I can probably find out..

**Captainfab** · 02-10-2018, 03:42 PM

If I'm not mistaken all GM engines from the mid '80 and up have 3/8" NPT for the temp senders in the heads.

**53burb** · 02-14-2018, 05:54 AM

As for it fitting the BBC Vortec heads....I can't give you a definite answer.
What is the engine designation number/code and year...I can probably find out..

I will get this info too u hopefully within a few days. Thx!!

joewell80 · 02-20-2018, 02:30 PM

I'll take one if you are still making them?

Thanks.

**A1971Blazer** · 02-20-2018, 02:34 PM

Quote:

Originally Posted by joewell80

I'll take one if you are still making them?

Thanks.

I have 10 of them ready to ship....I will PM you the info...thanks

01-06-2017, 10:33 AM	#1
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,188	Temperature sensor modification I had offered to try and modify a sender from ½ NPT to ⅜ NPT for a member but he never followed thru...last week I got a PM from another member wanting to try one. He sent me this one ACDelco....... G1852 I re-machined it on one of my CNC lathes...it looks like it will work just fine... sending it back for install....we'll see....? __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............

01-06-2017, 10:41 AM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,663	Re: Temperature sensor modification That's purty..that's a great idea..you should do some of these with metric threads to fit the LS heads..should be a fair demand for those...would beat drilling and tapping the head...

01-06-2017, 01:23 PM	#3
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,957	Re: Temperature sensor modification What would the cost for something like that be?

01-06-2017, 03:01 PM	#4
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,663	Re: Temperature sensor modification The hole size in the ls head is 12x1.25...that would be to small to mod the sensor...it would have to be 12mm (.472) major od with 10.466mm (.412) minor od..

01-08-2017, 08:43 PM	#6
storm9c1 * That's interesting * Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,772	Re: Temperature sensor modification I've seen other threads about folks doing this in the past. Great to see someone doing it again. I've found 2 VDO sensors that are very close to stock (electrically) in 1/8" NPT and come with a 3/8" donut adapter that works fairly well (there's an old thread on here about it). But nothing beats the stock sensors when paired up with the stock gauges. I'll definitely keep this in mind if I want to swap back to a stock sensor. This is clearly the best option. __________________ Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... Last edited by storm9c1; 01-08-2017 at 08:54 PM.

03-08-2017, 11:23 PM	#7
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,957	Re: Temperature sensor modification A1971Blazer, Have you heard back on the install? I'm getting ready to put my Vortec together. I noticed that your threads look a lot nicer than the factory threads, so I imagine it was a good fit. Any concern with weakening the brass, or is there enough meat there that it's not a concern? By the way, do you live up by the Cherokee National Forest? I have family that lives just the other side of the mountains, between Blowing Rock and Lenoir, NC. It's definitely what I would call God's country.

03-09-2017, 12:43 PM	#9
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,957	Re: Temperature sensor modification That looks really good. I'm sending you a PM.

10-15-2017, 04:01 PM	#10
Mike (Asheville) Registered User Join Date: Jul 2017 Location: Asheville NC Posts: 36	Re: Temperature sensor modification I can attest both to Whit's excellent work and the functionality of that Delco part. It's so nice to know the temp again. Attached Images

10-15-2017, 11:13 PM	#11
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,251	Re: Temperature sensor modification Saving for later....... __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

10-16-2017, 10:38 PM	#12
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,957	Re: Temperature sensor modification I got mine from Whit. Nice guy and beautiful work. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

10-18-2017, 07:39 AM	#13
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,188	Re: Temperature sensor modification Thanks for the kind words guys....this modification is easy for me to do...I'm happy to help fellow members to solve the dilemma of getting the temp gauge working properly.. For me......I like for everything to work like it should... __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............

11-04-2017, 05:02 PM	#14
min Registered User Join Date: Sep 2013 Location: Pa Posts: 102	Re: Temperature sensor modification I would be interested in one of these. Need the sending unit. __________________ 67 short bed step side build

11-16-2017, 04:16 PM	#16
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,188	Re: Temperature sensor modification OK....I got them and modded for the ⅜-NPT.... 2 are spoken for already.....(PM sent)...will ship as soon as paypal payment is received...thanks! 2 more available for immediate shipping __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............

11-20-2017, 12:11 AM	#17
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,251	Re: Temperature sensor modification I will take both of the senders you have left. Send me a PM with your PayPal info and I will send payment. Thanks. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

11-20-2017, 06:46 PM	#18
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,188	Re: Temperature sensor modification All 4 shipped today....you should see them Friday or Saturday...thanks again Anyone else interested....let me know.....I'll get some more going __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............



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02-07-2018, 04:34 PM	#19
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,188	Re: Temperature sensor modification I'm still doing these for anyone needing a modified sensor....it's not a money maker for me.......just a favor for members... __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............

02-10-2018, 05:00 AM	#20
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,007	Re: Temperature sensor modification are these for SBC Vortec heads in a 67-72? Are they the same for BBC Vortec heads?

02-10-2018, 03:42 PM	#22
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,251	Re: Temperature sensor modification If I'm not mistaken all GM engines from the mid '80 and up have 3/8" NPT for the temp senders in the heads. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-14-2018, 05:54 AM	#23
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,007	Re: Temperature sensor modification As for it fitting the BBC Vortec heads....I can't give you a definite answer. What is the engine designation number/code and year...I can probably find out.. I will get this info too u hopefully within a few days. Thx!!

02-20-2018, 02:30 PM	#24
joewell80 Registered User Join Date: Oct 2014 Location: Manitowoc, WI Posts: 52	Re: Temperature sensor modification I'll take one if you are still making them? Thanks.

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