Spectra EFI Tank what resistor for 68 fuel gauge? - Team Camaro Tech
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post #1 of 8 (permalink) Old Feb 8th, 10, 05:39 PM Thread Starter
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Patrick
 
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Spectra EFI Tank what resistor for 68 fuel gauge?

This is for an L92/Ls3 going into a 68. Cluster fuel gauge (Tic toc tach)
OK, I know the Grey wire is power to pump and purple is the fuel gauge.

Spectra said the tank sender range was 0-104 ohms approximately. (don't qoute me).

I thought someone put a potentiometer in line to find the correct resistor to make the fuel gauge work. I have not hooked it up yet.

Any radio shack part numbers out there ? Anyone use the 68 old gauges on modern tanks/senders?

Thanks guys!!!!!!!!!!!!!

1968 Convertible L92 VVT project, Hotchkiss lowering front & rear.

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Last edited by 68problemchild; Feb 8th, 10 at 07:11 PM.
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post #2 of 8 (permalink) Old Feb 8th, 10, 07:44 PM
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Re: Spectra EFI Tank what resistor for 68 fuel gauge?

The stock sender is 90 ohms, so you'll have about a 12% error. The gauge will work and will be useable.





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post #3 of 8 (permalink) Old Feb 9th, 10, 03:26 AM
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Re: Spectra EFI Tank what resistor for 68 fuel gauge?

X2 You can take the sending unit by itself, attach a jumper for power (body tan wire) and a jumper for ground to the body and test the gauge for indication with the ign key to ON.

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post #4 of 8 (permalink) Old Feb 9th, 10, 06:19 PM Thread Starter
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Re: Spectra EFI Tank what resistor for 68 fuel gauge?

Cool thanks!!! Wonder if it will read too full?

Here is some more detail on the tank for the next guy.
Sectra Premium EFI tank for 68 Camaro
US Gallon : 18
Liter : 68
Size : 39 3/8" x 20 7/8" x 7 3/4"
Strap Set : ST56
Comments : INCLUDES SENDER ASSEMBLY WITH STOCK-CAPACITY FUEL PUMP 85-115 PSI / 50-60 GPH; (0-105 OHMS); (45 FLARED FITTINGS (SAE) / THREADS 3/8 - 24)
Kit No : LO01

1968 Convertible L92 VVT project, Hotchkiss lowering front & rear.

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post #5 of 8 (permalink) Old Feb 10th, 10, 03:03 AM
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Re: Spectra EFI Tank what resistor for 68 fuel gauge?

Normally, it will read about a 1/4 inch past FULL. All you will be concerned about is when the gauge indicates 1/4 tank, you will fill the tank as the fuel keeps the pump cool.

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post #6 of 8 (permalink) Old Feb 10th, 10, 05:40 PM Thread Starter
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Re: Spectra EFI Tank what resistor for 68 fuel gauge?

Good stuff. Thanks Everette. You are the king of electrical.

1968 Convertible L92 VVT project, Hotchkiss lowering front & rear.

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post #7 of 8 (permalink) Old Feb 11th, 10, 10:27 AM
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Re: Spectra EFI Tank what resistor for 68 fuel gauge?

If you put a potentiometer in parallel to the sender and adjusted it to around 700 ohms you'd be a lot closer if it's really 104 ohms full to start with. You could get a 1k ohm pot so you had room to adjust if full is actually a different resistance. The hysteresis wouldn't be too bad at lower resistance values and would read pretty close at lower fuel levels

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post #8 of 8 (permalink) Old Feb 11th, 10, 11:22 AM Thread Starter
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Re: Spectra EFI Tank what resistor for 68 fuel gauge?

Thank you! Are you guys all electricians or what?

The tank:

http://www.flickr.com/photos/[email protected]/4310589950/

1968 Convertible L92 VVT project, Hotchkiss lowering front & rear.

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