Making a Vss signal

[Nykyforuk]

]Hi everyone

I'm making a 555 timing circuit to fool my fuel injection system to think
that 
its in the truck when its really on the dyno.
Bruce Plecan  instructed me to get a 555 timing chip which I did and a 7805 
voltage regulator. Has any one used these before (I know bruce has, I hope
he's OK), I need to figure out what caps and restitors to use to get the
frequecy
right. Also does anyone know how many pulses per mile the Syclone (7749)
computer uses. Last question do I use the DRAC module as well?

Thanks

Nolan
bnyk at oanet.com
1993 Syclone powered Sonoma