Tachometer and fuel gauge not working properly

[D-50Sport]

Hi,

The tachometer in my 1980 D50 sport is not working at all and the fuel gauge is acting strange. The fuel gauge reads empty when empty but when I fill it up the gauge goes below empty by about 1/2". I've checked fuses and everything is good. There are a couple connectors not hooked up to anything by the coil but not sure what they go to. I attached a couple pictures of the engine compartment and coil area for reference. Any suggestions would be appreciated.

t

[SubGothius]

Just speculation, but I wonder if the wires to the fuel gauge sender got swapped? Polarity inversion could plausibly explain the gauge moving backwards like that.

Tach wire (usually white IIRC?) takes a signal off the negative (-) terminal of the ignition coil.