Setting an L3 cluster to work with Gas

[88GreenVN]

I've got the VN Calais running on gas and the trip computer functions are not accurat at all. The DTE slowly increases with each tank.

Now the car runs mainly on gas now so I was thinking I should set the trip computer up to reflect the gas used.

So can we use the gas tank gauge (volts) to fix the tde?

Flow rate is no problem and can be adjusted to suit gas usage.

Distance would stay the same.

[HoZy]

I attempted it back then, I couldnt do it, unless I had some new fancy gas system.

Cheers
MaT

[88GreenVN]

I was thinking of taking the wire from the fuel gauge sender and connecting it to the gas tank. Would this work? Just do away with the fuel tank altogether or even have a switch between the 2.

[levymetal]

hmm, i don't think you can just grab the wire and connect it straight up. when i got gas installed in my car, i initially wanted the gas to show on the fuel gauge on the dash. when i got my car back, they had installed a separate gauge, because they didn't have the right 'part' to connect it up. i can't remember what exactly it was that they needed to get the gauge working on the dash though.

i was always interested to find out, did your AVG and fuel used functions work after all?

edit: have a look at this, might give you some ideas: http://www.aulro.com/afvb/technical-...lpg-gauge.html

[88GreenVN]

hmm, i don't think you can just grab the wire and connect it straight up. when i got gas installed in my car, i initially wanted the gas to show on the fuel gauge on the dash. when i got my car back, they had installed a separate gauge, because they didn't have the right 'part' to connect it up. i can't remember what exactly it was that they needed to get the gauge working on the dash though.

i was always interested to find out, did your AVG and fuel used functions work after all?

edit: have a look at this, might give you some ideas: LPG gauge - Australian Land Rover Owners

I think you can adjust the flow rate to be spot on with the AVG used. But the DTE keeps going up as the car has the same amount of petrol in the tank if you use gas 100% time.

So the main issue I can see is converting the gas tank gauge signal (assumed to be volts) to be the same as the petrol gauge (which is volts).

LOL - just read that link levymetal and it's ohms.... what ever they are....

[Cheap6]

I was thinking of taking the wire from the fuel gauge sender and connecting it to the gas tank. Would this work? Just do away with the fuel tank altogether or even have a switch between the 2.

The switch should be doable. Use a 5 pin relay actuated with the fuel changeover switch to switch between the output from the LPG and petrol tank senders.

So the main issue I can see is converting the gas tank gauge signal (assumed to be volts) to be the same as the petrol gauge (which is volts).

LOL - just read that link levymetal and it's ohms.... what ever they are....

The gauge senders, petrol and LPG, have resistances in Ohms that vary with tank level. A voltage into the sender will drop across the sender in proportion to the resistance, meaning a lower (signal) voltage out. (There will be another resistance in the circuit.) A search for "series DC circuit" on wiki or similar might help.

Assuming that the voltage into the petrol and LPG senders are the same, you will need to check that the sender you have now matches the petrol sender in resistance or if not find one that does. The resistance ranges - mentioned in the link above - are printed on the bottom of face of the little gauge, which is also the sender, inside the compartment on the LPG tank.

[markER717]

I think you can adjust the flow rate to be spot on with the AVG used. But the DTE keeps going up as the car has the same amount of petrol in the tank if you use gas 100% time.

So the main issue I can see is converting the gas tank gauge signal (assumed to be volts) to be the same as the petrol gauge (which is volts).

LOL - just read that link levymetal and it's ohms.... what ever they are....

Ohms are the resistance, just as Volts are pressure and Amps are flow. Hope that helps a little bit.

[88GreenVN]

I pulled a level 3 loom out of a gas powered VR last week and it had a wire from slot 20 on the 4th plug instead of the tan wire in slot 11. I just can find where the new wire went to. The interesting thing is it used slot 20 on the 4th plug. I need to find out where this wire went to and what slot 20 feeds to on the cluster.