Fuel Level on a DASH2
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From: Delaware, OH
Fuel Level on a DASH2
I've been asked this many times by PM or email so I thought I'd post it so it can be found by searches.
In the factory service manual, you can find the resistance range of the fuel sender for your model year of S2000. The DASH2 (or DL1 for that matter) reads voltage change not resistance change so you have to put that fuel sender into a voltage divider circuit (google it, if your not familiar). You want your circuit to give you as much voltage output range as possible so run some options with different fixed value resistors (you have to do the math). In selecting the value of the fixed resistor you also have to make sure not draw more current than your regulated 5v source can provide (I=V/R); R would be Rmin of the fuel sender plus the R of your fixed resistor. Radio Shack part # 7805 ($1.59) will do up to 1amp regulated at 5v, you should just use car voltage as that fluctuates.
In the factory service manual, you can find the resistance range of the fuel sender for your model year of S2000. The DASH2 (or DL1 for that matter) reads voltage change not resistance change so you have to put that fuel sender into a voltage divider circuit (google it, if your not familiar). You want your circuit to give you as much voltage output range as possible so run some options with different fixed value resistors (you have to do the math). In selecting the value of the fixed resistor you also have to make sure not draw more current than your regulated 5v source can provide (I=V/R); R would be Rmin of the fuel sender plus the R of your fixed resistor. Radio Shack part # 7805 ($1.59) will do up to 1amp regulated at 5v, you should just use car voltage as that fluctuates.
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