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Fuel Tank Sending Unit & Aftermarket gauges
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Chopchop
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PostPosted: Fri Jun 26, 2009 3:53 pm    Post subject: Fuel Tank Sending Unit & Aftermarket gauges Reply with quote

Hi

I'm going to put in a custom dash with custom gauges, partly because most of mine are shot and they need to be replaced anyway.
So, as far as the fuel gauge is concerned,

can anyone tell me how many OHMS the sending unit is in a stock Beetle fuel tank ?
The choices I have from the gauge company are :

0-30 ohm sender
0-90 ohm sender
16-158 ohm sender
240-33 ohm sender
75-10 ohm sender.

I'm usually confused but this time I am totally lost. Any help you can give me would be greatly appreciated.
Thank you,
Dave
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Chopchop
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PostPosted: Fri Jun 26, 2009 4:03 pm    Post subject: Reply with quote

To make that last post a little clearer,
They have a specific gauge for each of those sending units.

You figure out which sending unit you have and then buy the proper gauge.

I don't know how to figure out which sending unit I have.
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Viande
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PostPosted: Fri Jun 26, 2009 5:14 pm    Post subject: Reply with quote

Do you have a VOM?
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glutamodo Premium Member
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PostPosted: Fri Jun 26, 2009 5:32 pm    Post subject: Reply with quote

The stock tank unit is about 10 ohms full 73 ohms empty.

http://www.nls.net/mp/volks/htm/fuel_ga.htm

-Andy
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Chopchop
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PostPosted: Fri Jun 26, 2009 6:02 pm    Post subject: Reply with quote

Thanks Andy, that's a great start for me.

I don't know what a VOM is?
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glutamodo Premium Member
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PostPosted: Fri Jun 26, 2009 7:35 pm    Post subject: Reply with quote

VOM - that's a somewhat old-school term for Volt Ohm Meter, back when cheap analog test meters usually only did voltage and resistance. Mulitmeter is usually the term used these days, as digital meters usually come equipped to test for more than just volts and resistance.
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Chopchop
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PostPosted: Sat Jun 27, 2009 6:08 am    Post subject: Reply with quote

Ah. Thank you. Again I did not know that.

Thanks very much for the info on everything,

Dave
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Cusser
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PostPosted: Sat Jun 27, 2009 7:59 am    Post subject: Reply with quote

I'm a little confused: if you were using your existing gauge with a new sending unit, then, yes, you would want to match up the sending unit close to stock. However, if you are replacing both, these would just need to match these up, so empty is "empty", and full is "full" - so supplier needs to make sure you get compatible set; it would then be irrelevant what your original sender was.
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