MPG guage????
- Thread starter Big Dave
- Start date
On the Turbot it is a boost gauge so I'm assuming on the the model with it as an MPG gauge it is again just a vacuume gauge. If this is the case you would get as much/little indication regarding MPG with a standard after market vacuume guage.
I know I get much better eccomomy with the turbo if a keep the needle as far to the left as possible.
I know I get much better eccomomy with the turbo if a keep the needle as far to the left as possible.
Diver944
Active member
Hi Dave (met you at Walton Hall with Paul F) []
I've seen the gauge on some 2.5 Lux's, It is part of the instrument binnacle and is in the bottom half of the rev counter (where the Turbos have a boost gauge). I believe you would have to replace your clocks (and get the mileage changed) and connect the back of it into your vacuum pipe system in the engine. Maybe worth trying PorschApart to see if they've got one and if they think it would work.
Do 968 Tips have a gear indicator in the dashboard (this could be a problem)
]I've seen the gauge on some 2.5 Lux's, It is part of the instrument binnacle and is in the bottom half of the rev counter (where the Turbos have a boost gauge). I believe you would have to replace your clocks (and get the mileage changed) and connect the back of it into your vacuum pipe system in the engine. Maybe worth trying PorschApart to see if they've got one and if they think it would work.
Do 968 Tips have a gear indicator in the dashboard (this could be a problem)
my car has the MPG gauge, and I think it was fitted from the 944 introduction (82) up until the 84 model year(so it's only in the 'non-oval' dashboard cars) when it was consigned to the history books. It really isn't of much use at all, as it swings wildly as the throttle is pressed. It is purely a vacuum fed guage so as you press the throttle, the gauge moves to the '5 mpg' side, and as you lift off the throttle, it swings to the '40 mpg' side. So, as you go up throught the gears, it swings back and forth as the throttle pedal is pressed and released. It really is only of use 'at a cruise' on the motorway, when the guage settles down and gives more of a true reading.
berg944
New member
I have the MPG gauge in my Lux
When I first got the car I was transfixed by it.
Its was scary watching the needle point to 0 every time I accelerated.
It does work well on the motorway at constant speed, when you start going slightly uphill (keeping the right foot still) MPG drops to about 15 but when you go down hill it reads 60+
In fact, you can tell by the gauge if you are going slightly up or down when all seems flat!
The gauge reads 80-60-40-20-0
I think it will be alot cheaper in the end to watch the road not the gauge!
Do not bother will the gauge just buy a moped........because you will have to accelerate like one to keep the needle central.
You already know what a gauge will tell you.......69..... more right foot = Pleasure / bigger fuel bill (Pain)
You could also try making a sticker that permanently reads 40mpg just for therapy........should also fool the wife.
Oval Dash and no vacuum pipe to it.
When I first got the car I was transfixed by it.
Its was scary watching the needle point to 0 every time I accelerated.
It does work well on the motorway at constant speed, when you start going slightly uphill (keeping the right foot still) MPG drops to about 15 but when you go down hill it reads 60+
In fact, you can tell by the gauge if you are going slightly up or down when all seems flat!
The gauge reads 80-60-40-20-0
I think it will be alot cheaper in the end to watch the road not the gauge!
Do not bother will the gauge just buy a moped........because you will have to accelerate like one to keep the needle central.
You already know what a gauge will tell you.......69..... more right foot = Pleasure / bigger fuel bill (Pain)
You could also try making a sticker that permanently reads 40mpg just for therapy........should also fool the wife.
Oval Dash and no vacuum pipe to it.
Diver944
Active member
What an excellent thread [] I never realised it was purely a vacuum gauge with some numbers written above it. I thought it was some clever electronic trickery using the DME, injector cycles, engine speed etc.
Dave, I know you haven't got a TIP (coz I lurk on 968UK.com), I just wondered if you'd rise to the bait []. You realise you have the perfect opportunity to alter the gauge before installation to any number of amusing things instead of 0-40 mpg
] I never realised it was purely a vacuum gauge with some numbers written above it. I thought it was some clever electronic trickery using the DME, injector cycles, engine speed etc.Dave, I know you haven't got a TIP (coz I lurk on 968UK.com), I just wondered if you'd rise to the bait [
]. You realise you have the perfect opportunity to alter the gauge before installation to any number of amusing things instead of 0-40 mpg
eastendr
New member
It's neither a vacuum gauge or vacuum operated.
It's fed by a separate signal from the DME computer that calculates fuel injection and RPM go give an approximate MPG reading.
I replaced the rev counter in my 944S with a rev counter from a 944 LUX that had the MPG gauge fitted. HERE
It's only the rev counter that has to be replaced, so no milage corrections etc are necessary. The whole job only took about a half hour (I've got a quick release steering wheel).
I don't know if it would work on a 968 as I've not got wiring diagrams for the 968 series. Assuming the 968 still uses the same type of DME, it does not necessarily follow that the wiring loom would be the same and carry the necessary signal wire from the DME to the instrument cluster.
HTH
It's fed by a separate signal from the DME computer that calculates fuel injection and RPM go give an approximate MPG reading.
I replaced the rev counter in my 944S with a rev counter from a 944 LUX that had the MPG gauge fitted. HERE
It's only the rev counter that has to be replaced, so no milage corrections etc are necessary. The whole job only took about a half hour (I've got a quick release steering wheel).
I don't know if it would work on a 968 as I've not got wiring diagrams for the 968 series. Assuming the 968 still uses the same type of DME, it does not necessarily follow that the wiring loom would be the same and carry the necessary signal wire from the DME to the instrument cluster.
HTH
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