LPG Conversion kit for 79 RR

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Originally posted by LandyAndy
Hi guys
You need an LPG specific gauge to read LPG,cant recall exactly the ratings,but the petrol and gas senders run on completely different ohms.If needed I can check tommorow wich the LPG is(1 is like 90 ohms and the other 180 ohms,but thats a guess) as I have a near new LPG VDO gauge in my 109,a working petrol gauge wouldnt work correctly on LPG.The switches that make the dash gauge read LPG have a built in conversion factor.A petrol gauge wont read correct on a LPG tank and vice versa.
Andrew

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Yep, you're right.
A check of the VDO website confirms this.

I have twin gas tanks, so the signals are probably summed to form 180ohms.
Can't tell. Both gauges (petrol & gas) look identical.

But definately worth considering if installing from scratch.

There is a calibrater available to change the output to the correct ohms, but if you work out what the dash gauge range is in ohms , a simple resistor or 2 will fix that. With twin lpg tanks, set the gauge to read off the tank furthest away from the T piece. In my other Rangie, the lpg gauge was one of those led ones that fits under the dash but i kept bashing it with my knee.