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Unread 04-02-2008, 10:23 AM   #1
HEADSPACEXXX
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Fuel gauge, temp gauge

Some of the supply catalogs say you should replace the fuel and temp gauge as a pair, but looking through the info in the links below I did not see anything said about it. Can I put a new (after market) fuel gauge in and it work with the old temp gauge?


http://users.adelphia.net/~john.stre...QuickFacts.htm

Check these out also:
http://users.adelphia.net/~john.stre...for_cj_gau.htm

and

http://users.adelphia.net/~john.stre...eQuickTest.htm

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Unread 04-02-2008, 10:30 AM   #2
Mike Romain
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No, the fuel gauge has a voltage regulator in it that feeds both the fuel gauge and the temp gauge.

You could hook up an electronic 5 volt regulator to just feed the temp gauge I guess, but the voltage going back to the fuel sender might be an issue. The fuel sender is expecting to regulate 5 volts to ground, not sure what 12 would do to it or the readings the gauge would see back.
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89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 04-02-2008, 11:32 AM   #3
John Strenk
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Quote:
Originally Posted by Mike Romain View Post
No, the fuel gauge has a voltage regulator in it that feeds both the fuel gauge and the temp gauge.
You could hook up an electronic 5 volt regulator to just feed the temp gauge I guess, but the voltage going back to the fuel sender might be an issue. The fuel sender is expecting to regulate 5 volts to ground, not sure what 12 would do to it or the readings the gauge would see back.
Not realy sure what you mean there Mike. The Fuel sender doesn't adjust the regulator. ?? Well it kinda does but not realy. The regulator realy does not set a certian voltage, it regulates how much current is delivered to the system IF the sysem needs more power then the pulses get longer, if it needs less current then the pulses get shorter. Pulse width is effected by input voltage and temperature. Pulse height is 12 volts.

Maybe he's talking about an aftermarket gauge that fits in the speedo but some of those only run on 12 volts also.

A couple of the Aftermarked direct replacement gauges seem to be calibrated for thier own constructions and may not work with the OEM gauge. That's one of the reason to replace them in pairs.

If you had a lot of time you could probably adjust the fuel gauge to work properly with the temp gauge. You would have to first adjust the regulator on the fuel gauge to match the temp gauge and then adjust the Full scale and 0 adjustment on the fuel gauge.

The regulator adjustment on this aftermarket gauge is on the left thru a hole in the case. The other adjustments are noted.

Last edited by John Strenk; 04-02-2008 at 11:42 AM..
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Unread 04-02-2008, 01:04 PM   #4
HEADSPACEXXX
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Mike
It is a after market gauge but it is the factory style that goes in the speed-o cluster, not a stand a lone fuel gauge. This is the note from the 4WHEELPARTS.COM web site.

Fuel Gauge in Speedometer Cluster;1972-86

Should be replaced at the same time as the temperature gauge. Note: Fuel sending unit may have to be calibrated for fuel gauge to work properly.
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Unread 04-02-2008, 01:51 PM   #5
Mike Romain
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Quote:
Originally Posted by HEADSPACEXXX View Post
Mike
It is a after market gauge but it is the factory style that goes in the speed-o cluster, not a stand a lone fuel gauge. This is the note from the 4WHEELPARTS.COM web site.

Fuel Gauge in Speedometer Cluster;1972-86

Should be replaced at the same time as the temperature gauge. Note: Fuel sending unit may have to be calibrated for fuel gauge to work properly.
Cool, sounds like it would work with a bit of adjusting. I just checked one of my old sets and it too has the adjustments for power and top and bottom end of the tank on it. This one fried though, it stuck on full power, pinned both the gauges out and cooked the coils in both of them.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 04-03-2008, 05:26 AM   #6
HEADSPACEXXX
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Man these forums are great, you get help with pictures, the place I ordered the fuel gauge from did not say in their catalog it had to be replaced in pairs, but I saw it in other catalogs, the parts are suppose to be in firday, I wonted to make sure when I installed the fuel gauge it was not going to burn up.

thanksalot
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