Ok this is one of those you "know or you don't" sort of questions. Guesswork isn't going to be helpful.
I have been trying to sort a sub fuel tank gauge. Now I can't fit the OEM one in the headlining because of my after market sunroof so forget that. I have mounted the OEM sub tank and sender and they are fine and I am not going to take the tank off again that's for sure.
So here's the issue. Most 52mm gauges that I can find (and I bought a really nice one) work on a range Full to Empty of 10 Ohms to 180 Ohms. But it seems that the OEM sub tank sender runs 3 Ohms to 110 Ohms.
I can't seem to find one that will suit that range. OK so here's the thing. I am not that fussed about it reading full accurately. If it reads full for 100 miles and I know it does that, it's not an issue. What I really need is an accurate reading of nearly empty. OK both would be good but not sure if I am going to be able to do that.
With the figures that I have to meet being LOWER than the gauge I have, can I just add some resistance into the circuit to adjust the impedance? The sender is a variable resistor so is any pre load I put on there going to work across the range? Or can I only affect it at the empty end. OK simple Paddington Bear maths here. If I need it to read 110 Ohms when empty but the gauge needs 180 to read that, can I just add 70 Ohms in there in line? If I do will that now have 73 Ohms when full leading to a reading of half full on the gauge? See, I need technical help on this one. If I could build clever circuits then I'd have something with a chip in it where I pressed SET at empty and SET 2 when full and that would be great. But I can't. I was having some chap in SA make me a gauge with LEDs that did this but he disappeared into the bush never to be seen again.
Ideas chaps please. Might this in fact be the answer? http://www.ebay.co.uk/itm/Low-Fuel-...180?pt=LH_DefaultDomain_3&hash=item589cb7ff44
There do seem to be programmable gauges out there but we need to be realistic on price. £40 OK at a push, but £190 to solve this seems a bit steep. Most of these seem to be in the US. I have cut the hole, but if there is someone can make a clever LED display that reads from 3 to 110 Ohms then please let me know and I'll fill the hole in! I did by a digital one which was sexy but has the same impedance ratings. Maybe that could be 'fooled'
Ta Chaps
I have been trying to sort a sub fuel tank gauge. Now I can't fit the OEM one in the headlining because of my after market sunroof so forget that. I have mounted the OEM sub tank and sender and they are fine and I am not going to take the tank off again that's for sure.
So here's the issue. Most 52mm gauges that I can find (and I bought a really nice one) work on a range Full to Empty of 10 Ohms to 180 Ohms. But it seems that the OEM sub tank sender runs 3 Ohms to 110 Ohms.
I can't seem to find one that will suit that range. OK so here's the thing. I am not that fussed about it reading full accurately. If it reads full for 100 miles and I know it does that, it's not an issue. What I really need is an accurate reading of nearly empty. OK both would be good but not sure if I am going to be able to do that.
With the figures that I have to meet being LOWER than the gauge I have, can I just add some resistance into the circuit to adjust the impedance? The sender is a variable resistor so is any pre load I put on there going to work across the range? Or can I only affect it at the empty end. OK simple Paddington Bear maths here. If I need it to read 110 Ohms when empty but the gauge needs 180 to read that, can I just add 70 Ohms in there in line? If I do will that now have 73 Ohms when full leading to a reading of half full on the gauge? See, I need technical help on this one. If I could build clever circuits then I'd have something with a chip in it where I pressed SET at empty and SET 2 when full and that would be great. But I can't. I was having some chap in SA make me a gauge with LEDs that did this but he disappeared into the bush never to be seen again.
Ideas chaps please. Might this in fact be the answer? http://www.ebay.co.uk/itm/Low-Fuel-...180?pt=LH_DefaultDomain_3&hash=item589cb7ff44
There do seem to be programmable gauges out there but we need to be realistic on price. £40 OK at a push, but £190 to solve this seems a bit steep. Most of these seem to be in the US. I have cut the hole, but if there is someone can make a clever LED display that reads from 3 to 110 Ohms then please let me know and I'll fill the hole in! I did by a digital one which was sexy but has the same impedance ratings. Maybe that could be 'fooled'
Ta Chaps
I was just looking at the sellers other items and spotted it they do a version with a warning light as well as the correction
