TL;DR???
Some thing like this maybe 2 and some custom wiring and components also.
http://dccontrol.com/65p35.pdf
The electric option is not off the shelf part ,its a full custom system and may require a "raspberry pi"
How to use the Raspberry Pi B+ computer for your next DIY project - PCWorldor other custom softwere/hardware. If the Raspberry Pi is needed, iit can be my stand in for obd2 for a mpgeineo, or similer data loger, more parts would be needed of corce
Gumby. Be flexible