LS1 VDO Tach

[GlynMeek]

I followed similar 'advice' about buying the 'tach adapter'...and did. No use at all...waste of money, gathering dust. Turned out that all that was wrong was I had the microswitches on the back of the VDO tach set incorrectly. Before you spend ANY money on 'tach adapters' or 'boosters' from anyone, experiment with these microswitches a little bit. Sorry Sideshow, the tach adapter MUST be set to 8, sometimes the switches make it look like 4, but it's just the way the documentation (online if you need to get it!!!) makes it look!

let us know when you solve this!

Glyn

[Aussie Mike]

Originally Posted by GlynMeek

Sorry Sideshow, the tach adapter MUST be set to 8, sometimes the switches make it look like 4, but it's just the way the documentation (online if you need to get it!!!) makes it look!

let us know when you solve this!

Glyn

Hi Glyn, When using any tach with an LS1 the tach definitely needs to be set for 4 cylinder. The LS1 uses 8 individual coil packs each with it's own in built driver circuit. The ECU runs them in 2 banks and only takes the tach pulse from one bank hence the 4 cylinder setting.

On a conventional V8 with a distributor, yes set the tach to 8 cylinders. The LS1 is a bit of a different animal.

I'm using an Autometer 5" monster tach and it has no trouble running off the lower signal level.

Cheers