Fuel Guage Goes Up Then Partly Fades -- 72 Swinger

That's awesome. I'm thinking the IVR is the fault.

If it is truly electric I see no reason for it's output to go high then settle down.

Now technically the origional mechanical ones would provide full voltage for a few seconds then start osolating on and off to regulate the votage / current.

The one you have MIGHT be mimicking that.

The Realtime Engineering IVRs claim that is what they do and even output a square wave.

How much did you pay for your IVR.

The resisters you would need are 10, 23 and 70 the gauge and sender are not liner.

With these values you should see ABOUT full, ABOUT half and ABOUT empty.

I have a graph in a number of posts that show the curve.

NOW it is entirely possible that the level shown is correct for the crappy aftermarket sender.

Many people self included report

Gallons in tank = gauge reading
Full = full
3/4 = 1/2
1/2 = 1/4 to E


Sender resistance in FSM

RTE limiter - rte


"Our limiter exactly duplicates the original limiters function by slowly switching 12V on and off.
Our limiter has a built in polyfuse which protects the limiter and your wiring from short circuits on the output of the limtier
Our limiter constantly looks for short circuits on the output of the limiter and will switch itself off if a short circuit is detected. When the short is removed, then the limiter starts working again.
Our limiter has a built in diagnostic LED that blinks when the limiter is on, helping you see that you have power to your dash and that the limiter is operating properly.
Our limiter has a warm up time at turn on, same as the original mechanical limiter. This means that your gauges will come up to the proper reading very quickly.
Our limiter is always outputting a constant 5V average, no matter what the input voltage is (Within the range of 9V to 18V). If the input voltage goes too high or too low, then the limiter shuts off"