 Hyfire and silver dot tach - Working!, Mod your tach to work with a hyfire box |
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| agrump |
 Apr 10 2005, 05:31 AM
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#1
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Member  Group: Members Posts: 141 Joined: 13-November 04 From: Atlanta, GA Member No.: 3,103  |
My early silver dot tach did not work at all once I installed a hyfire ignition box. This is caused by the fact that the stock tack is looking for a high voltage signal that no longer exist. I was able to modify the tach to run off of the Hyfire's tach port by placing a jumper over the initial signal resister. As a side note I experimented with the hyfire's tach testor and found that the stock tach is pretty acurate.
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| machina |
Apr 10 2005, 06:21 AM
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#2
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Advanced Member Group: Benefactors Posts: 2,030 Joined: 21-June 03 From: Miami Beach, FL Member No.: 848  |
that's great.
I could never get mine to work and just went with an autometer. Does the old tach still bounce around alot? I kind of got used to the dead steady new tach but I would go back to the original unit if it worked OK. |
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| Aaron Cox |
Apr 10 2005, 10:26 AM
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#3
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
my hero!!!! (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif)
need to do tis ASAP (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) |
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| Aaron Cox |
Apr 10 2005, 02:55 PM
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#4
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
hmmm... mine looks different....
could be because it is a 912 tach (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) ill open up a 914 one too... |
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| agrump |
Apr 11 2005, 05:39 AM
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#5
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Member Group: Members Posts: 141 Joined: 13-November 04 From: Atlanta, GA Member No.: 3,103 |
synthesisdv, it still bounces around like a squirrel in the middle of the road. That could probably be cured by place a capacitor across the needle leads but I didn't think to try it. It's kind of tough to see what is happening on the circuit board because it wraps around the needle mechanism.
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| machina |
Apr 11 2005, 05:46 AM
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#6
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Advanced Member Group: Benefactors Posts: 2,030 Joined: 21-June 03 From: Miami Beach, FL Member No.: 848 |
hey dean,
you seem to know your way around a circuit board. How hard do you think it would be to transplant the guts of my autometer into the silver dot porsche tach? I wouldn't want to do it if I couldn't use the silver dot needle. |
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| Joe Ricard |
Apr 11 2005, 10:31 AM
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#7
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
I don't think I will ever go back to stock tach. Love my Autometer and the shift light.
I can see the light out of the corner of my peripherial vision while screaming though the cones. set it go go on at 5800 RPM I find I am staying off the rev limiter and shifting to 3rd earlier pulling WAY harder to the next feature. Pretty cool to be able to fix the stock one though (IMG:http://www.914world.com/bbs2/html/emoticons/clap.gif) |
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| Aaron Cox |
Apr 11 2005, 10:39 AM
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#8
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
ill be doing this on friday.
i didnt know the hyfire had a tach testor.... (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) |
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| maf914 |
Apr 11 2005, 11:05 AM
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#9
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None 
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Okay, for the benefit of those of us who have never disassembled gauges, could someone describe how to disassemble a VDO tach. I assume disassembly is from the gauge face side?
I think I could handle soldering the jumper around the resistor, but I just don't want to ruin the gauge taking it apart. Thanks. |
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| Aaron Cox |
Apr 11 2005, 11:07 AM
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#10
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
uncrimp the bezel...a royal PITA. then take the 3 or 4 screws out from the back. voila..... done. |
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