2nd Gen Non-Engine/Transmission Aftermarket Fuel Gauge OHM question...

[Cummnzpowr]

Since after the swap i did from 24-12valve some of you guys know my fuel guage absolutley won't work no matter what i try. SO. . I am eyeballing an AutoMeter aftermarket fuel level gauge "phantom" series that looks pretty cool and am gonna put it on the steering column pod. My question is there's all types of "OHM" ratings for these gauges, and of course why would someone put one {besides me} in a 98' Dodge Ram right?Can anyone tell me what OHM range is needed for this?I think it'll be pretty trick if i can get it to run right... any help would be appreciated.

 

[B.G. Smith]

I have a Haynes manual on 94-98 Dodge trucks, it gives the values for gas truck sending unit and in Diesel section on fuel level it refers back to the gas section so they may be the same. It says 10 ohms full and 112 ohms empty. bg

 

[GBaines]

Fuel Guage

My stock sender stopped at 1/4 full, and I ran out of fuel outside of LaPaz, Mex. When I got a new sender from the dealer, it did not meet the Ohm specs in my manual, so I sent it back and got another, which also did not meet specs. So I cleaned my old one, now it works, and at the same time installed an after market sender and guage. Now I have two guages for safety. Once you have the tank down, it is easy to clean the old sender and install an after market one for safety.

 

[Joe G.]

The Haynes manual is wrong. We ran into this some months ago. I'm trying to find the correct measurements. Both full and empty are a little higher. A new stock sending unit will be right. If I can find my notes I will post the correct measurements.



If you get the correct manual you won't run into nearly as many errors.

 

[B.G. Smith]

The Haynes manual is wrong. We ran into this some months ago. I'm trying to find the correct measurements. Both full and empty are a little higher. A new stock sending unit will be right. If I can find my notes I will post the correct measurements.



If you get the correct manual you won't run into nearly as many errors.

I agree 100%. I don't have a 98 Dodge so I really don't need a manual for that year model. Looks like my incorrect manual and your notes are of about equal value at this time?? bg

 

[Joe G.]

I found it. It is supposed to be full 3. 8 ohms, empty 103. 3 ohms. I ran into this one when I was building an automatic controller for my auxilliary tank. My old fuel sending unit was acting up. I fixed it so it was not acting flaky, but the reading was off. Someone else posted the Haynes measurments in response to my query. Mine were really close, but the gauge was off. I fooled around with the old sending unit for a while trying to get it to work right, but it was more stubborn than me. I got a new one from Dodge. The measurements above are from that and correspond to a new sending unit I installed in a friend's truck. My gauge is accurate now. No big deal if you are off a few tenths of an ohm but being off several ohms will mess up the reading. I suspect that the gauge is ok. The service manual shows a way to test it to see if it will show full and empty. No big trick to that test. Just a little jumper wire on the connector to the tank. There is a different connector on my friend's '97 than my '95 so I can't give you the pins for the test for sure. My pump controller needs a smooth and correct voltage from stock fuel sending unit so it knows when the main tank is low and when it is almost full.

 

[Cummnzpowr]

...

Thanks for the info gents, however you missed the point of this gauge for my purpose. I don't have a sending unit problem, it worked correctly BEFORE my engine swap. . so since i have no ecm anymore and the 12 valve PCM is silly,i need to wire up a gauge to a good pre-existing sending unit wire. . however i am sure the gauge i bought will be fairly close {8-12 ohms full/78 ohms empty}...