Usually talaga, pag nagpapalagay ng indiglo, mejo magagalaw yung mga needles. I just had mine installed 2 weeks ago, tapos nung binalik yung gauge, yung sa fuel indicator ko, lower than when I had it changed. Pero, when I topped up my tank, umakyat naman, and its been acting normally.
Try to top up, then observe the needle. Pag hindi tama yung reading, then nagalaw ng sobra yung needle, at nawala sa calibration, kasi nga sensitive yan sa pressure. Sa casa, they can try to re-install and re-calibrate your gauge.
See if reverting back to your original gauge will fix the problem, and if it does, then the indiglo gauges have something that needs fixing before it can be properly installed on your car again.
I had the same problem before. Pagka-install ng indiglo ko, ayaw naman gumana ng fuel gauge. As in umilaw na yung "red fuel icon" to indicate na wala na ako fuel, saka ko lang nalaman na sira gauge ko.
Binalik ko dun sa pinag-installan. Masyado lang pala nadiinan yung pagbalik nung needle. So, tinanggal nila yung needle, then dahan-dahan binalik hanggang "ma-feel" (I'm not sure about this) daw nila yung "tension" ng needle.
Ok na sya ngayon. Baka nadiinan lang. To be safe, balik mo sa pinagpa-installan mo. Or kung malakas loob mo, baklasin mo yung gauge cluster, dahan-dahanin mo i-pull yung needle. Kasi sa GSR, nung binaklas uli nila yung gauge cluster ko, pinull lang ng konti, then nung pag-start ko ay pumunta sa tamang reading yung fuel gauge.