Vintage Gauge Wiring

[phileas_fogg]

OK; for the Speedhut gauges use the instructions starting about 3/4 way down on Page 52 (GPS Vintage gauge install), with one addition. For the volt meter, attach yellow sender wire to the RF brown gauge feed wire (along with the red power distribution wire show in the picture at the bottom of page 55). That ought to get you up & running.

One other word on the fuel gauge. It determines the fuel level by measuring the resistance provided by the fuel sender. Speedhut typically ships them calibrated for the stock Mustang fuel sender. This means the gauge is most likely expecting a resistance of 16-158 ohms. To find out if you've got a different fuel sender, unplug the fuel gauge from the RF harness and measure the resistance across the RF light green fuel sender and RF black fuel sender ground wires. Then add a gallon of gas, and measure the resistance again. You should quickly get a feel for whether your sender is providing a range different from standard, in which case your next step is to calibrate the gauge to accommodate (you can do this any time; calibration isn't going to hold up your wiring or your build). The gauge instructions will help you figure out which calibration you need.


John

P.S. Also, if you're using EFI, don't mess with your fan or fuel pump circuits yet. You need to understand what your EFI computer provides before wiring those circuits. It's also likely you'll need a coolant temperature sensor to feed the EFI computer and a second one to feed the temperature gauge. Finally, you may need a wire off the negative terminal of your coil for the EFI computer and a second wire to feed the tachometer.