Aboardman
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| posted on 9/8/06 at 06:42 AM |
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fuel gauges
looking at some gauges for a mini project and found these
http://cgi.ebay.com/ebaymotors/DOLPHIN-6-PRO-TAN-STREET-ROD-GAUGES-WITH-GOLD-RINGS_W0QQitemZ4583157769QQihZ002QQcategoryZ80739QQssPageNameZWDVWQQrdZ1Q
QcmdZViewItem
based on the currant exchange rate of £1-$1.91 that is just over £100 for gauges which i think is a good price, (awaiting cost of postage).
my question is the fuel gauge by using a standard sender unit, this possible may not work right with the gauge, how can you adjust this, is it a case
of adding some resistors etc. to alter the voltage back to the gauge.
thanks
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02GF74
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| posted on 9/8/06 at 07:34 AM |
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quote:
Originally posted by Aboardman
my question is the fuel gauge by using a standard sender unit, this possible may not work right with the gauge, how can you adjust this, is it a case
of adding some resistors etc. to alter the voltage back to the gauge.
I am using defender guages with series senders (landrover).
Now firstly the series sender is designed for a guage that runs of 9V, the defender guage runs on 12 V.
Secondly the series sender works in opposite direction to defender sender i.e. when series sender is empty, defender guage would show full and vice
versa.
I wrote all that to illustrate the 2 problems you will face.
... but going back to the first sentence you can see this can be overcome.
I made a small circuit using 2 op amps to firstly compensate for the supply difference and to invert the signal so the gauge follows closer with what
is happening in the tank.
Ideally you want to know the supply for the guage and what resistance for full/empty then find a suitable sender otherwise you need in the simplest
case, a resistor, worst case some electronics like I have.
It will look like this: (note there are 2 identical circuits with adjustment pots since I have two underseat tanks and twin guages - if you have a v8
in a Land Rover you'd understand why).
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Aboardman
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| posted on 9/8/06 at 07:46 AM |
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the gauges come with a sender unit but doubt it will fit a mini tank unless i can modify it, but it will be easy to get the resistances.
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Danozeman
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| posted on 9/8/06 at 09:13 AM |
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U can modify the float arm on alot of senders if they wont fit in your tank.
You may be lucky with your original sender. It may well be the same resistance values as the gauge.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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