qim Posted March 19, 2017 Report Share Posted March 19, 2017 (edited) I am looking for a spare fuel gauge and saw one with numeral markings for 1/4 and 3/4 full, while mine, which I believe to be original only has vertical markings in those places. Could you tell me which is correct, please? Thanks Edited March 19, 2017 by qim Quote Link to post Share on other sites
rhino_mac Posted March 19, 2017 Report Share Posted March 19, 2017 It should just have white lines for the 1/4 and 3/4 full marks, not numbers. So yours would be the correct type if it has these markings Quote Link to post Share on other sites
qim Posted March 19, 2017 Author Report Share Posted March 19, 2017 Thanks Quote Link to post Share on other sites
RAHTR4 Posted March 20, 2017 Report Share Posted March 20, 2017 Hi Qim, The easiest method to check for the correct gauge is by the markings on the dial face. An original TR3 and 3A fuel gauge will have FG.2530 / 20 printed in white around the top of the dial face. See following photo of a correct gauge in a rather dirty as found condition. Regards, Richard Quote Link to post Share on other sites
david ferry Posted March 20, 2017 Report Share Posted March 20, 2017 Don't forget that there are two different, yes similar in appearance fuel gauges for sidescreen cars. The number on the other gauge is X49422/220. PG163. To make matters a little worse, each of these fuel gauges has a matched tank sender unit. PG163 gauge needs a sender marked on the top with the number FT3331/02. The gauge discussed by Richard at post #4 needs a sender marked on the top with ST-202137R 80085/ Consequently, to have a gauge that works properly, it's important to have a matched pair. David Quote Link to post Share on other sites
Lebro Posted March 20, 2017 Report Share Posted March 20, 2017 Or get them calibrated together Bob. Quote Link to post Share on other sites
david ferry Posted March 20, 2017 Report Share Posted March 20, 2017 I don't think that the calibrating them together will work - if they are not a compatible pair, they aren't compatible! David Quote Link to post Share on other sites
Lebro Posted March 20, 2017 Report Share Posted March 20, 2017 We will just have to agree to disagree then !! As long as the sender is intended for the moving iron type of gauge (low resistance = empty), then they can be made to work. I have re-calibrated several of these from various sources. If however the sender is of the type intended to drive a bimetallic strip type gauge, then it will all read backwards as the senders are wired the other way round - low resistance = full. Cheers Bob. Quote Link to post Share on other sites
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