Aftermarket dash info??

[xworks]

Trying to wire in a second hand dash display to a car at the moment,
unfortunately the item came without wiring diagrams or operating instructions
The dash is made by Sparco and if anybody could offer any info/diagrams
it would be greatly appreciated (specifically how to change how many
cylinders the tacho reads, currently set to 4 need to change to 6)
Cheers.