For those of you that may be interested:
I recently installed a Koso TNT aftermarket all in one cluster. For the most part the install was straight forward.
I did run into issues with the following:
1) adapting the stock speed sensor to work with the cluster
2) getting a good clean tach signal from the ECU
3) getting the Neutral light to work properly
Solutions:
1) At first I attempted to build a circuit that would convert the Sin wave output from the stock sensor to a 5v digital signal. While I was able to model a working circuit with a simulator, in reality it did not work. It could have been many factors.....After having a couple glasses of thinking whiskey, I thought there may be an easy solution. There was: In the stock cluster there is a rectangular board (3/4" x 3") that does exactly this. All I did was apply 12v +, Grd, Sensor + and Grd and ran an out to the cluster. Works like a charm.
2) By just connecting the tach signal wire from the ECU (pin 19 I think), the tachometer would jump/bounch around. This is typical of a dirty signal. Why it is dirty coming off the ECU, I have no idea. After some searching online I used a design for a filter. Connections are IN, OUT, and Grd. Works like a charm.
3) I believe that the solution for this has been covered many times. The only thing different I did was use 12v electronics relays instead of automotive relays. This was done for space considerations, as well as power consumption. I have not tested the durability of this yet...more to follow.
If anyone would like more info, ask away, I will see what I can do.
Cheers
Rick