VN speedo pulse autometer gauge

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
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GMVN
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Joined: Mon Jan 20, 2020 9:59 pm
cars: Holden

VN speedo pulse autometer gauge

Post by GMVN »

Hi
New to the new forum.
Looking at putting and autometer dash setup in my VN.
A bit stuck on the speedo wiring.

I know the VSS sends a 10 pulse signal to the VN cluster which divides it by 5 then sends it to the factory ECM a 2 pulses per revolution.

The speedo output on the autometer gauge is a +5v sine wave signal.
Is this sufficient for the ecu or do i need a different speed sensor for the transmission? A 2 pulse sender maybe?

Any info much appreciated.
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delcowizzid
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Re: VN speedo pulse autometer gauge

Post by delcowizzid »

The factory 3 wire hall effect is a square wave signal. You could tee off the input to the dashboard and run it direct to the ecu but you will need to change the ppk in the tune to the same as vr like about 6250ppk
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GMVN
Posts: 2
Joined: Mon Jan 20, 2020 9:59 pm
cars: Holden

Re: VN speedo pulse autometer gauge

Post by GMVN »

Cheers delcowizzed...
Is that hard to do...i would assume you need the tuning software?

I was thinking of just changing the vss to a 2 pulse as thats what the ecu reads but whatever is easiest.
pman92
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Re: VN speedo pulse autometer gauge

Post by pman92 »

Reprogramming the memcal and running the speed sensor directly to ECU would be the easiest.

If you don't have the equipment someone on here could do it easily enough if you post your memcal to them
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