Hello.
I was able to make some Spek Gauges work but I don't have the details any more.
But I will tell you what I did.
First of all, you need a potentiomemter.
you want a multi turns linear potentiometer of value 10K (10.000 ohm). the value is not critical. it could be 5k.
something like this:
http://www.ebay.co.uk/itm/5-Pack-3296-Multiturn-Variable-Resistors-Potentiometer-Preset-Trimmer-Pot-/121694846730it is importante the potentiometer is multi turns and linear.
now, the main connections from the gauge are:
- 12V, tocconected to the 12V terminal of the Pro-Gauge.
- ground, connected to the GND terminal of the pro-Gauge
- and the signal wire that is connected to the S1...S6 termianl of the pro-Gauge.
when the gauge is connected to the Pro-Gauge, take the potentiometer and connected the pin the center to the signal wire of the gauge.
connect ONE pin at the sides of the potentiometer to the 12V terminal of the Pro-Gauge.
Open the Pro-Gauge configuration screen and move all the slides to the left, to zero.
Start rotating the potentiometer's screw in one direction or in the opposite one. at some point you should be able to see the needle moving. if it doesn't move, disconnect the pin of the potentiometer connected to 12V and connect it to GND instead.
If this work and the needle moves, position the needle around the middle position and configure the gauge using the Pro-Gauge configuration screen. if the gauge is too sensitive to the adjustments made in the configuration screen, move the blue jumper from position 1 to a higher one.
you have to play around a little bit with the potentiometer, the configuration screen and the blue jumper.
if you manage to make this sequence work but the needle keeps oscillating up and down, a small capacitor will help.
you will need a 220nF capacitor rated at 24V minimum. the longer pin must be connected to the S1...S6 terminal and the shortest one to the GND terminal.
This is a general approach that so far worked for me in many case. it is fundamental that you are able to make the needle move using the potentiometer.
Regards
Cristiano