Fuel guage values. Lapuwali?, Here we go again..... |
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Fuel guage values. Lapuwali?, Here we go again..... |
Dr Evil |
Feb 28 2005, 09:10 PM
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#1
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Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
So I am in the process of putting my VDO fuel gauge in. I decided to call NH speedo, and PA speedo again to see what they had to say for values. I did this because last time I called them they told me 10-180 ohm empty-full. This was disputed by lapuwali (IIRC) when he said it was 0-90 ohm and I believed that he had tried it. I believed what he had to say, but was confused by the info that I had gotten from the "pros". Well, when I called today I got even wackier numbers. NH speedo told me that I needed a gauge that went from 67-1.8 ohms empty to full. WTF! PA speedo told me that thier tech had gone home for the day and they couldn't tell me anything. Both places offered to calibrate the new gauge for me for as little as $65. One guy said that all they would have to do is insert a POT to change the values.....I don't think so. If the full value is now the low one and the empty the high, you cant change them by using a POT. So basically I am back where I started: No real clue.
Lapuwalli, did you get it to work with a 0-90 ohm? Anyone else? I am trying to add to the information so someone can sift throught hte confusion later on. |
lapuwali |
Feb 28 2005, 10:10 PM
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#2
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
OK, I have THREE (count 'em) spare 914 fuel gauges on the shelf (how did this happen?). I used my benchtop 12v (13.6v) power supply and a handful of mixed resistors I had lying around.
0 is full. Short the gauge terminal to ground and it pegs full. A 100 ohm resistor (99.2, really) didn't deflect the needle from "no connection". A pair of 100ohm resistors in parallel (49 ohm measured) put the needle at a tad above 1/4 tank. So, empty is somewhere between 50 and 100ohms. A 100ohm and a 300ohm resistor in parallel (about 70ohms measured) put the needle at about halfway between 1/4 and R. So, it looks like 0-90 (full to empty) is indeed the range for these gauges. I were wrong... (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif) (I think I first heard this from Dave Darling though, so it's really his fault ) (IMG:http://www.914world.com/bbs2/html/emoticons/rolleyes.gif) Fortunately, this is a REALLY common ohm range, used on scads of GM vehicles, and VDO makes a 0-90 gauge in all of their styles, as do Autometer, et al. Works for me, considering my 914 currently has a 911 oil temp/pressure gauge, and I've been relying on using the oil pressure light in that gauge as the low-fuel light. I think I even HAVE a VDO 0-90 fuel gauge in my parts bin... |
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