1973 AMX 140 speedo

Mopar_guy wrote: I took 2" out the length of the arm on mine and I used a newer style float from a Ram pickup to make it easier to deal with than those old round floats. I also had to rebend the arm to get it to swing in the right arc. I didn't have to mess with the stops. I'll check to see if I took any pictures. Mines still not perfect but it works well enough to count on it. It's more accurate on the low side and that's where it counts to me.

Thanks for the info, as I thought some length had to play about the scale on the resistance wire. Bending IMO, shortens the scale before hitting the stop. I would not think 2 inches would be needed, but there you go. I was thinking since I may move to a hornet wagon tank, to modify the new replacement to work with it. Thus getting rid of my good oem one, since I don't want to mess with modifying a good piece.

Which brings me to another thing about gas tanks, which I will make a thread on, not to hijack.

The new Javelin level unit I bought (all stainless from eBag) the ohms range was 12 to 85 ohms instead of 12 to 60 ohms that the gauge is calibrated too. I shortened up the range of travel to fix that problem by bending the stop tab. Other than that I did not touch the resistance unit on the sending unit. I remember it still being off so I added some sort of resister into the line at the back of the cluster to calibrate it closer. The original sender wasn't even right so there's something with the cars wiring that's different. I have an electronic CVR as well. I put that in when I did all of this because I needed it to be right due to the amount of driving I do in it. You're just going to have to mess with it to get it right since the aftermarket stuff is not the best.

Mopar_guy wrote: Oh, and one other thing reading 304's post - I was putting a Javelin sending unit into a new Spectra AMC1 tank, which is deeper than a stock Javelin tank and I still had to shorten the arm 2 inches! I don't see how they would work in the shallower Javelin tank.

Well then, I guess it is a no brainer, new hornet wagon tank with the aforementioned new sender plus some tweaking, arm and all should be good to go. Not sure if the AMC1 tank is the same, but when going for 20 gallons, i assume one will be using some of that long arm.

I am tempted to mess with my sender to take notes and such for reference, just so I don't get set thinking everything is going to be as so easy. Since nobody has made the resistance 100% perfect.

I may not be a perfectionist, but dealing with not having a fuel gauge reading function as I am use to, just annoys me as if I am.