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im not gonna say what it cost me to make it, dont wanna hurt anyones profits. but i was no where near what race shops charge for speed signal converters. the most expensive thing was the cluster itself, $150. if you look up the parts i used on digikey.com youll see what it cost me.
making a NICE plug and play one is where the extra cost will come in. getting a profesional board made out where i am is about $100, plus the cost of the nissan connectors and the case might make it expensive.
I didnt go to school for any of this. granted ive been messing with electronics for about 15 years. first i read the FSMs, then i used a o-scope to look the signal from the speed sensor and measured it for mph whith the car on jackstands. then i used a function generator to find the right freqs for the cluster (i got the signal type from the fsm). google is a wonderful thing, i just looked up frequency-to-voltage converters and voltage-to-freqency converters (since i needed 2 back to back, freq-voltage-voltage-freq), read all the spec sheets, did the math that they said to do for the conversions. then built it and tested it.
everything just takes effort and time, thats how mountains are turned to dust
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