Old Fuel Guage & New Sender = wrong reading?

[Hate For State]

OK, I know that the guage that I have in my factory 84 dash operates on a 10 - 75 ohm range but the sender from my 91 EFI tank reads something like 240 - 30 ohm range so I am getting the wrong reading on my guage. Does anyone know what the guage in like an 86 or 87 EFI ranger reads? Maybe I can just swap the guage from a newer, but same style cluster, into my old cluster.

I want to keep the stock guages if anyone knows how to fix this problem. Preferably without having to drop the tank again. Thanks

 

[Totalled]

The sender ohm changed with the dash, so '89 and later, 88 and older.

 

[Hate For State]

That's what I thought. I don't want to have a guage on the dash that don't work so looks like I'm making a trip to the junkyard this weekend to tear apart some 90's ford clusters to find a guage that fits. I read the schematic and with a little soldering I should be able to wire up the slosh module, cover it in heatshrink, and stuff it in the dash. If my retrofit works I post up some pics next week.

 

[Hate For State]

Here are the pics of my modified fuel guage. I took out the old guage from my 84 cluster and ground out the posts to make the backing smooth. Then I took the guage from a 91 ranger and pulled off the needle and cut the section of clear plastic away from the black plastic face. I glued the Clear plastic section to the old guage face. I peeled the sticker off the newer face and marked where the light needed to shine through the sticker and drilled the old face plate out before glueing the sticker down. I cut the printed circuit board off where it connected to the old guage. I drilled holes in the cluster and pushed the 3 pins in the guage through the back and cut them off about 1/8" long and soldered the power ground and signal wires directly to the guage. I took the slosh module from the newer cluster and wired it inline with the guage signal wire and power wires and wired it into the dash then I covered it with heatshrink from an R/C car battery pack. Luckily I had a fuel pump and sender from a 89 bronco 2 that I wired up temporarily to set the needle back on the guage in the right place then I filled the tank just to double check it. It works great and looks better than I thought it would. I hope this helps others trying to keep their dash original.