Fuel Gauge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ghettoluxury · 11-06-2009, 02:44 AM

Will a Sunpro fuel gauge work with a stock GM sending unit?

ghettoluxury · 11-07-2009, 08:27 PM

tt

**fixit-p** · 11-08-2009, 12:07 AM

The sunpro is designed to work with their sending unit which opperates from Full: 33 ohms to Empty: 240 ohms.

**byrd** · 11-08-2009, 09:13 AM

Quote:

Originally Posted by fixit-p

The sunpro is designed to work with their sending unit which opperates from Full: 33 ohms to Empty: 240 ohms.

I do not know anything about sunpro gauges, but that seems backwards to me. Shouldn't the higher resistance value be Full and the lower empty?

**fixit-p** · 11-08-2009, 10:58 AM

That was cut and pasted from Sunpro's sending units spec's (Resistance specifications: Empty: 240 ohms 1/2: 130 ohms Full: 33 ohms) They do it so you have to use their sending unit. I remember another post on here where the op had an aftermarket sending unit 0-90 ohms but it was backwards (90 empty and 0 full) and could not be used.

**'68OrangeSunshine** · 11-08-2009, 02:46 PM

When the float is up above the fuel level at full, the rheostat has minimal resistance. When the tank is low and the float is on the bottom, there is maximum resistance.

**fixit-p** · 11-08-2009, 04:07 PM

Right, bottom line is that a Sunpro gauge will not work with stock GM sending unit

ghettoluxury · 11-08-2009, 07:54 PM

Thanks for the info guys

11-06-2009, 02:44 AM	#1
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 491	Fuel Gauge Will a Sunpro fuel gauge work with a stock GM sending unit? __________________

11-07-2009, 08:27 PM	#2
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 491	Re: Fuel Gauge tt __________________

11-08-2009, 12:07 AM	#3
fixit-p Senior Member Join Date: Dec 2008 Location: Yay Area CA Posts: 759	Re: Fuel Gauge The sunpro is designed to work with their sending unit which opperates from Full: 33 ohms to Empty: 240 ohms. __________________ 1965 GMC shortwide big window 1969 Chevy C20 long (for now) 1988 Toy 4x4 (My Beater) 1994 1500 4x4 Burb 1995 Toy 4 Runner 3.Slow (Wife's Beater) 2004 Taco 4x4 3.Fast

11-08-2009, 10:58 AM	#5
fixit-p Senior Member Join Date: Dec 2008 Location: Yay Area CA Posts: 759	Re: Fuel Gauge That was cut and pasted from Sunpro's sending units spec's (Resistance specifications: Empty: 240 ohms 1/2: 130 ohms Full: 33 ohms) They do it so you have to use their sending unit. I remember another post on here where the op had an aftermarket sending unit 0-90 ohms but it was backwards (90 empty and 0 full) and could not be used. __________________ 1965 GMC shortwide big window 1969 Chevy C20 long (for now) 1988 Toy 4x4 (My Beater) 1994 1500 4x4 Burb 1995 Toy 4 Runner 3.Slow (Wife's Beater) 2004 Taco 4x4 3.Fast

11-08-2009, 02:46 PM	#6
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 1,660	Re: Fuel Gauge When the float is up above the fuel level at full, the rheostat has minimal resistance. When the tank is low and the float is on the bottom, there is maximum resistance. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

11-08-2009, 04:07 PM	#7
fixit-p Senior Member Join Date: Dec 2008 Location: Yay Area CA Posts: 759	Re: Fuel Gauge Right, bottom line is that a Sunpro gauge will not work with stock GM sending unit __________________ 1965 GMC shortwide big window 1969 Chevy C20 long (for now) 1988 Toy 4x4 (My Beater) 1994 1500 4x4 Burb 1995 Toy 4 Runner 3.Slow (Wife's Beater) 2004 Taco 4x4 3.Fast

11-08-2009, 07:54 PM	#8
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 491	Re: Fuel Gauge Thanks for the info guys __________________

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