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140 mph speedo swap and?
now the fuel gauge is at 1/2 after a fill up. I swapped out the 85 mph for a 140 mph speedo for my 89 Mustang GT. I filled up at half a tank last night with 7.7 gallons and the gauge only rose a bit above 1/2. I left the car running when I was filling up and when I got home I shut it off and the started it again, the gauge rose to 3/4 and then fell back to just above 1/2. Is there something different with the 140 speedo fuel gauge hooking up to the old harness's of the 85 speedo fuel gauge?
Thanks..
4 Answers
- happy2b_whiteLv 61 decade agoFavorite Answer
The voltage from the fuel level sending unit doesn't match the voltage from the system that has a 140 mph speedometer. You'll just have to get used to it. Fill the gas tank by mileage instead of the gauge reading.
- 1 decade ago
The fuel gauge in the 140 mph unit requires a fuel sender unit with less resistance than yours,so it will under-read.
should carry a spare 2 gallons with you and then run it empty and see how bad the under-read is.
- 11second rideLv 41 decade ago
the float in the tank could be messed up and yeah i just switched my 85 to a 140 speed o in my 88
- erikf15038Lv 51 decade ago
If you don't have any wires disconnected then I would look at the fact that either your gage cluster may have a issue or you may need to re-flash your ecu I would check the back of the cluster make sure everything is connected all the way.
