72 Blazer w/ 77 Engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tek707 · 04-16-2010, 03:15 PM

Hi folks,

I'm trying to figure out how to get my 72 Blazer temperature gauge to work with a the sending unit in my 77 350 engine. I have headers so Ihave the sending unit on the block. Any suggestions?

Thanks in advance!

fixit-p · 04-16-2010, 06:54 PM

Use a sending unit from a 72

tek707 · 04-16-2010, 07:33 PM

Sending unit from a 72 doesn't fit. The threading porting is much larger.

I read somewhere that the ohms on a 77 sending unit are different from a 72 and not even inline resisters would work.

fixit-p · 04-16-2010, 08:14 PM

Is the head not have the threaded port, I know you said you have headers but you should still be able to use the stock location on the head provided it is there. There are some threads I've seen on this site where the stock 72 sender was machined and threaded to fit vortex heads.

72freak · 04-16-2010, 08:18 PM

Find another hole to put it in! LOL I put mine in a thermostat housing with a sensor thread hole in it.

Longhorn Man · 04-16-2010, 08:37 PM

the hole in the head is too small, or too big?

04-16-2010, 03:15 PM	#1
tek707 Ready, Set, Off-Road! Join Date: Nov 2009 Location: Los Angeles, CA Posts: 29	72 Blazer w/ 77 Engine Hi folks, I'm trying to figure out how to get my 72 Blazer temperature gauge to work with a the sending unit in my 77 350 engine. I have headers so Ihave the sending unit on the block. Any suggestions? Thanks in advance!

04-16-2010, 07:33 PM	#3
tek707 Ready, Set, Off-Road! Join Date: Nov 2009 Location: Los Angeles, CA Posts: 29	Re: 72 Blazer w/ 77 Engine Sending unit from a 72 doesn't fit. The threading porting is much larger. I read somewhere that the ohms on a 77 sending unit are different from a 72 and not even inline resisters would work.

04-16-2010, 08:18 PM	#5
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	Re: 72 Blazer w/ 77 Engine Find another hole to put it in! LOL I put mine in a thermostat housing with a sensor thread hole in it. __________________ 2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! *It's not just a hobby..It's a LIFESTYLE!!!* Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere!

04-16-2010, 08:37 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: 72 Blazer w/ 77 Engine the hole in the head is too small, or too big?



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