I have a 2011 Sigma and both Fuel Gauge and Oil Pressure gauge are reading zero. I started out by checking the actual fuel gauge by shorting the sense terminal to earth - the gauge reads full so that seems ok… I was then about to set to work checking things at the sender end – but thought I would search on here first. Seems on older cars the sender signal is a black & green wire that goes straight through to the gauge. However, in my case it is a yellow at the gauge end (although there is a green/black at the tank). Looking at the wiring diagram, the yellow at the gauge comes from the tacho! Anyone know what is happening here – does the sender signal just get wired into tacho and then straight out again, or is the tacho actually doing anything? Anyway using a multimeter to check the various lines, gives the following: Yellow from gauge to Tacho - Good Green/black from Sender to Tacho – Good Sender: green and black terminal to earth terminal is reading ~28Ω (tank ~quarter full) Tacho: green and back terminal to yellow terminal open circuit If the signal is supposed to go straight into the tacho then straight out, the above would suggest a tacho fault? But what could possibly go wrong with a direct internal connection?? Same question goes for the oil pressure gauge – I see that this is also fed from the tacho…. Seems a coincidence that both gauges fed from the tacho have failed? Could this be a similar tacho fault (though it’s working fine as a tacho)? Any thoughts /experience would be welcome… Thanks