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MN | Arduino has 14 digital input/output pins, and 6 analog input pins that can be used as digital. To run a solenoid you'd need some more circuitry to handle the current, and the voltage spikes when you turn on/off the solenoids and some pull up/down resistors for the switches. On my controller I'm using 4 inputs for the switches, 7 outputs for the LED's and controlling the motor controller over a serial connection.
What are the bottom clutch switch and power (t77, t78) for? Are the speed sensors the transmission output RPM?
Kind of a swag for a basic setup.
Arduino $30
I'm having a hard time finding a transistor board that's already built, could probably make one for about $20.
Locking For/Neut/Rev switch $20 (Cheapest I could find, they are ridiculously expensive)
Shift Toggle Switch body $4.06, Switch actuator $1.16. A little different than the switch I'm using now, but lots cheaper.
Enclosure either $13 or $26 depending on how big the parts end up being
Serial LED display $13. To save IO pins, I'd ditch the individual LED's to show the selected gear and Just show the gear on the display.
You'd need the same connector and wiring as your setup, about $15?
About $125 in parts. I usually double that to account for shipping/screwups/extra parts needed.
You could get way more complex than the basic setup, but this should be able to almost eliminate shifting into neutral during gear changes, could program it to delay shifting out of the current gear before shifting into the next, just a few milliseconds to account for the oil flow through the transmission. Should be able to program it to skip-shift to speed, etc.
First one may not be real "pretty".
It would take a bit of playing around to get the parameters all set right.
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For Case 4994 owners, "Twin Disc" transmission controller solutions
