• Main Home Page
• Today's Hot Topics
• Start a New Discussion
• Search Discussion Forums
• Forum FAQs
• General Topics
• Builder's Corner
• Buyer Beware
• Detailing Tips
• How To (How Do I?)
• Looking to Buy
• Paint Booth
• Q n A
• Reader's Choice Awards
• Tech Tips

• Hot Topics
• need help understanding instrument gauge compatability???
• air ride
• dade city cruise in dec 6
• winter storage
• a modern day mystery
• christmas turkey recipe
• attn. brian
• molded body cars
• turkey run 2008
• 1933 pontiac now at home
• 1930-31 model a front/rear fiberglass fenders
• 72 pinto drag car
• seats
• to all former marines
• putting sbc in 65 chev pu that was originally 6 cyl
• camaro clip i.d.?
• amish in the mall..
• victoria's '48 pick up
• streetrodding.com nostalgia
• steering lock up

Quick Search:

Choose ... Advertisers Builders Corner Projects Car Clubs Discussion Forums (Blogs) Event Coverage News and Articles Parts For Sale StreetRods For Sale StreetRodding.com Members Upcoming Car Shows

douglas wilde (aka hotrodfreak) [ View ] [ hotrodfreak@comcast.net ] [ Car Ads ] [ Blogs ] hancocks bridge, New Jersey (856) 935-8349

Merry christmas all! Ive gota little problem I need some advice with. Im nearly done redoin my dads 1969 david brown 990 diesel tractor. Ive replaced the fuel tank sender with a factory org , but cannot get a org gauge.. ive installed a napa replacment fitsall type 12 volt gauge. It pegs hard full when the key is on regaurdlee of sender level. ive varified grounds- continuitys ect. I believe i need to install a resister inline that feeds the gauge, but i dont know how I would find the resistance needed. Any help guys?

Comments

Posted by Crazyhorse Rod Shop  -  12/18/2005 03:56 PM you can go to radio shack and get some ohm resistance diods and adjust it. they come in different sizes. i do this on orig gauges to adjust oil pressure and temp. should work on the gas gauge. but i'm no sparktrision. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by hotrodfreak  -  12/18/2005 07:53 PM Always a pleasure to hear from 'ol Shiney , Thanks buddy I forgot all about the shack- Ill try em. hotrodfreak [ View ] [ Email ] [ Blogs ] [ Car Ads ] hancocks bridge, New Jersey   Posted by jimmothershead  -  12/22/2005 10:04 AM For 25 years, you have seen my ads in most rod magazines = "Gas Tanks & Vintage Titles". The sender must be compatible with the gauge. Most after market gauges are 240 to 80 ohms. There are 9 other resistances. Always bench test both before installation.....so now remove both and do it. Most guys do not read instructions.....ha, ha. Most guys do not run a dedicated ground wire from one of the 5 sender mounting screws to a clean frame location...hopefully the frame is grounded correctly also. So no matter what the resistance, if both are compatible, swing the sender arm up, gauge should read full, Half way down, half tank. Bottomed out, empty. If opposite, reverse polarity. If still no fix, like another rodder said, Radio Shack. Do you still have the boxes and instructions that came with the new parts? They will tell the required resistance. Do not install any kind of resistors to make it work....most will get warmer and give a false reading. Otherwise, call me at 410 535 1933 or 410 535 1932 in Maryland. Happy Holidays, Jim Mothershead Jim [ View ] [ Email ] [ Blogs ] [ Car Ads ] Huntingtown, Maryland   Posted by Crazyhorse Rod Shop  -  12/18/2005 08:08 PM when they peg hard they are going full ground. might be a short or sender/power reversed. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by hotrodfreak  -  12/18/2005 11:30 PM The gauge has two poles - one gets 12v from ign switch the other goes to the sender. The sender is made of plastic , so it has two poles- one for a ground leg , the other to gauge.Its a very simple setup - 12v fed to a varible ground [the sender] and the resistancew reads in the gauge .....right? I think i understand the funtion but dang if it'll cooperate. hotrodfreak [ View ] [ Email ] [ Blogs ] [ Car Ads ] hancocks bridge, New Jersey   Posted by JAWS  -  12/19/2005 11:32 AM Try this, if you have a ohmmeter. Ground one lead and connect the other to the sender wire or sender, with it disconnected from the gauge. Move the sender from full to empty or viceverse. This will give you the ohm range the sender was designed for. Some examples: 0-90 with 90 being full, 240-30 with 30 full, there are others, I don't remember off hand. The problem is you can't mix and match unless you use resistors like Shiner said. If your gauge "sweeps" from one side to the other when you ground the wire at the sender, with it disconnected from the sender, then your gauge and wire is ok. If you disconnect the wire from the sender and the gauge still "sweeps" full then you have a short either in the wire to the sender or in the gauge it self.-Brant An electrical headache can make a great car a pain [ View ] [ Email ] [ Blogs ] [ Car Ads ] Boise, Idaho Charter Member since August 2004   Posted by JAWS  -  12/22/2005 12:03 AM Is it a 6 volt system? I would think in '69 it would be 12 volts. What or who made the sender? An electrical headache can make a great car a pain [ View ] [ Email ] [ Blogs ] [ Car Ads ] Boise, Idaho Charter Member since August 2004   Posted by hotrodfreak  -  12/22/2005 10:22 PM The gauge was a generic Napa replacement because Case/ david Brown does not stock it anymore. The sender is oem , the org had a metal body with no additional ground wire used- and the new one is plastic and i made up a ground and varified continuity to it .How do I "find" the reduced voltage? is there a variable reostat kinda thing I can put inline between the Hot and the gauge temporarily and change resistances to find the needed #? I really appreciate the help, This tractor means a lot to my Dad. hotrodfreak [ View ] [ Email ] [ Blogs ] [ Car Ads ] hancocks bridge, New Jersey   Posted by hotrodfreak  -  12/22/2005 10:23 PM By the way its aneg grnd 12v system- Thanks again! hotrodfreak [ View ] [ Email ] [ Blogs ] [ Car Ads ] hancocks bridge, New Jersey   Posted by tlp1968  -  12/22/2005 12:16 PM Jim I hope you have switched from magazines to the Internet- Hee-hee Seriously if you are still in the business remember we love advertisers. Especially nice guys who offer their advice to our beloved members. Tammy- 877-787-6337 StreetRodding.com Marketing Director [ View ] [ Email ] [ Blogs ] [ Car Ads ] Springfield, Illinois Charter Member since August 2003   Posted by hotrodfreak  -  12/21/2005 07:20 PM Thats how I checked the sender before I installed it in the tank. it worke d fine then I varified grounds and continuities ect... but the gauge apparently needs voltage reduced , but by how much? hotrodfreak [ View ] [ Email ] [ Blogs ] [ Car Ads ] hancocks bridge, New Jersey   Posted by Crazyhorse Rod Shop  -  12/23/2005 09:16 AM once again, go to the shack and get some diodes. put them in the sender line. i use aligator clips. chang until you get the reading you want. you have to change the ohm resistance so it will read right. otherwise you have to change the sending unit. there is no other way to do it that i've ever heard of. the diodes come in 10's at the shack. about .30 each. i've got a drawer full of them. great to adjust temp gauges and such as most lie. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by paul274854  -  12/22/2005 10:26 PM If you have the original gauge, you probably can get it fixed. One company I have dealt with and like is Williamsons. www.williamsons.com paul274854 [ View ] [ Email ] [ Blogs ] [ Car Ads ] Midland Park, New Jersey

Back To Top

Please Login or Register to Comment

Existing Member? Sign In.

New Visitor? Click Here to Get Started!

Existing Member but forgot your Login Information? Click Here.