Aftermarket Fuel Gauge Acting Funky

[ValiantBoyWonder]

- "Equus 7361 Fuel Gauge" -link to instructions - sec "C" middle of pg2 http://equus.com/Content/Support/Manual/93-0011.revB.pdf
- Used alligator clips and thick wire for ground strap
-cleaned all surfaces and sender with electrical cleaner

- Using the shop manual, i figured "G4-18DBL" would be the fuel gauge wire

-After hookup, the gauge would read about 1/4 tank when the tank is full
-i do not own a ohm meter (but will find one soon) to check and make sure the readings are correct - 70-75ohm empty and 10-15ohm full (according to FSM)
-i got out and shook the car back and forth, when i checked the gauge again, it had moved to a little above a 1/4 tank. (i thought maybe the arm and float were stuck in the tank, and shaking the car would get it to "loosen up" ?)
- it does not fluctuate when i turn the dash lights on.

my question is:
maybe i have it hooked up to the wrong wire?
maybe the voltage regulator used on the old dash had something to do with it? i do not have the old dash but all aftermarket gauges.
where can i get a ohm meter without breaking my pocket?
if the float and arm are stuck in a position, is there a way to "unstuck" them without dropping the tank?

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70 Plymouth Valiant 4dr

[WagonsRcool]

You can get a digital Volt/Ohm meter for abour $25 from radio shack / home despot / lowes etc. You can also get a small pack of resistors from radio shack to substitute "known-good" resistance values to see if the guage works properly.

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63 Valiant Wagon
225 - 4 bbl

[wjajr]

Look under “C” Fuel Level gage:
http://equus.com/Content/Support/Manual/93-0011.revB.pdf

Diagram shows a 12 volt supply, Chrysler gage uses 5 volts. If you are using same 5 volts that feed the original gage, you need to find a switched 12 volt source for the new gage.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC