Temperature guage sending unit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

onelow69 · 08-12-2003, 01:58 AM

Where is the best location to place the sending unit to the temperature gauge. In the block or in the manifold. It seem that since i switched it from the block to the manifold it seems to read hotter, I also bought a new sending unit from Kragens, could have I recived the wrong part, do they have different ohms for the sending units. Any info would be a great help. Thanks

ChevLoRay · 08-12-2003, 08:26 AM

There are a couple of sizes of sending units, depending on several things. But, it shouldn't be a problem to find/install one in the correct position. I installed a new engine wiring harness on mine, and the sending unit, too. Since my original '69 block has later model heads on it, we had to "shop" for the right sending unit, but got it done. My guage works just fine with new wiring and a new sending unit.

I don't know why you'd see a difference in coolant temp, with placement in the intake vs. the block or a head. In my opinion, the hottest place it can go, is right where mine is, between two exhaust ports.

70 CST 4X4 · 08-13-2003, 08:30 PM

TTT ----
I am also interested in what all of you have got to say about the location of the sending unit. I am going to be putting in my new motor soon and was going to put mine in the intake.

70 CST 4X4 · 08-14-2003, 07:33 PM

Call me onelow69. I have some info you wanted.

Longhorn Man · 08-15-2003, 12:43 AM

I think in the head is the best place for it. If you overheat, the head will get hot before the intake, which will give you more time to react before bad things happen. Besides, who cares how hot the intake is...I'm worried about teh actual engine...true, they should be the smae temp, but if everything was like it should be...you wouldn't need the guage.

BobbyK · 08-15-2003, 03:46 AM

Listen...GM put it there so...

Then again they did put it in the thermostat housing in the newer Blazer's and trucks.

I think the GM design team was BIG on the 4:20

08-12-2003, 01:58 AM	#1
onelow69 Registered User Join Date: Jan 2003 Location: Central Cal Posts: 124	Temperature guage sending unit Where is the best location to place the sending unit to the temperature gauge. In the block or in the manifold. It seem that since i switched it from the block to the manifold it seems to read hotter, I also bought a new sending unit from Kragens, could have I recived the wrong part, do they have different ohms for the sending units. Any info would be a great help. Thanks __________________ 69 Chevy Truck, 350, 400trans, Lowered 3.5/6, Disc brake conv, All early classic stuff. 62 Chevy Nova 350, 700R4, 2400stall, F9in, 3.70gear, AlburnPosi, Chevelle Disc Brakes, ect.

08-12-2003, 08:26 AM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Left cylinder head There are a couple of sizes of sending units, depending on several things. But, it shouldn't be a problem to find/install one in the correct position. I installed a new engine wiring harness on mine, and the sending unit, too. Since my original '69 block has later model heads on it, we had to "shop" for the right sending unit, but got it done. My guage works just fine with new wiring and a new sending unit. I don't know why you'd see a difference in coolant temp, with placement in the intake vs. the block or a head. In my opinion, the hottest place it can go, is right where mine is, between two exhaust ports. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

08-13-2003, 08:30 PM	#3
70 CST 4X4 Have A Nice Day! Join Date: May 2003 Location: California Posts: 356	TTT ---- I am also interested in what all of you have got to say about the location of the sending unit. I am going to be putting in my new motor soon and was going to put mine in the intake. __________________ 1970 CST K10 350/350/205 Short Bed - Fleetside Tach-Tilt-A/C-Tow Hooks Front & Rear Disc Brakes Front & Rear Posi 3.73 Gears 30 Gallon Stainless Fuel Tank SOLD 01/18 !!!!! 2007 2500 HD Classic Crew Cab LT2 4X4 Duramax LBZ

08-14-2003, 07:33 PM	#4
70 CST 4X4 Have A Nice Day! Join Date: May 2003 Location: California Posts: 356	Call me onelow69. I have some info you wanted. __________________ 1970 CST K10 350/350/205 Short Bed - Fleetside Tach-Tilt-A/C-Tow Hooks Front & Rear Disc Brakes Front & Rear Posi 3.73 Gears 30 Gallon Stainless Fuel Tank SOLD 01/18 !!!!! 2007 2500 HD Classic Crew Cab LT2 4X4 Duramax LBZ

08-15-2003, 03:46 AM	#6
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,771	Listen...GM put it there so... Then again they did put it in the thermostat housing in the newer Blazer's and trucks. I think the GM design team was BIG on the 4:20 __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

08-15-2003, 12:43 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I think in the head is the best place for it. If you overheat, the head will get hot before the intake, which will give you more time to react before bad things happen. Besides, who cares how hot the intake is...I'm worried about teh actual engine...true, they should be the smae temp, but if everything was like it should be...you wouldn't need the guage.

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