[lnfletcher]

If you do go Rostra 250-1223 kit and you have a Tremec tranny using the VSS output, get the Rostra VSS Divider (Divide By 4) module part # 250-4379. Of course you'll need the clutch switch also. (250-3372)

This allows you to use the VSS output instead of the magnets on the drive shaft and the pickup.

Also set the unit switches to all off except for 3,4 and 10. This sets it to 8000 pulses per mile and square wave input.

I include this because I had to find this out the HARD way after many hours of trial and error. Seems there is not a lot out there on the VSS output on the Tremecs and the interface to the Rostra.

After these options and settings, the unit works flawlessly! IMO!