vp tachometer wiring to ls1

[jca]

Hi I'm trying to hook the tachometer out put wire from a ls1 to the vp std tachometer in the dash has any one done this

[festy]

Is the VP tacho a v6 or v8 version?
I'd assume the ls1 tach signal is ttl, so you'd need to modify a v8 tacho to use the v6 style signal?

[VL400]

Also by default the LS1 tach output is only 2 pulses per rev, so V8 tach will read half RPM. I think this can be adjusted in the PCM calibration.

[jca]

It was a v8 car yep ls1 reads like 4cyl but I can change with efi live found the ls1 output but not sure which wire is the tachometer wire on the cluster