 Tach for my SIX, options |
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| Trekkor |
 Feb 4 2005, 12:00 PM
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#1
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I do things...  Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California  |
My engine uses the point and condenser ignition.
The SIX tach I had was for a car with the Bosch CDI box module. Not compatible. wrong idle speed and "floaty" needle after that. the FOUR tach however is very responsive and constant, just 150% too high. (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) Question is this: besides paying $275 to have my tach refaced and recalibrated, is there a Radio Shack electronic componet that could be wired before the Tach to "calibrate" it? In affect tricking the tach into thinking I still have a FOUR? (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif) Anbody got a pre '69 SIX tach that goes up to at least 8k RPM's? I don't want to use a "Sun" or "Auto-Meter" guage. VDO is what I want. KT |
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| SirAndy |
Feb 4 2005, 12:07 PM
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#2
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Resident German Group: Admin Posts: 41,636 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
just play with different resistors until it goes down to 100% ... (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) Andy PS: i'm not sure if this works btw., i don't know how the tach signal actually looks like when it get's to the gauge ... i can't imagine it to be a steady current ... |
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| mightyohm |
Feb 4 2005, 12:11 PM
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#3
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest  |
How about adding a CDS ignition to the engine?? Something you should do for racing anyway...
Cheaper than paying $275 for a recalibrated tach!!!!! (Ouch.) |
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| Root_Werks |
Feb 4 2005, 12:11 PM
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#4
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Village Idiot Group: Members Posts: 8,319 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest 
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Dude, don't get rid of the 911 tach you have. If it is for the 3 pin CD box, keep it. Now, go out and find a 3 pin CD box (used is fine) or spend $150 on one of the MSD 6A CD's.
You will spend $$ on another tach or an ignition upgrade. Spend it on the ign upgrade. If you find a 3 pin CD box, let me know, I can send you the wirring diagram for it. Easy hook up. Keep the points, loose the condensor (points trigger the box). Oh, I guess the coil would have to go as well. Trust me, it is a much better system. I might even have a 3 pin box if your interested. Coil too. (IMG:http://www.914world.com/bbs2/html/emoticons/idea.gif) |
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| Dr Evil |
Feb 4 2005, 12:17 PM
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#5
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Send me your transmission! Group: Members Posts: 22,995 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
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I am not certain about the particulars (it would take me a while to relearn the required info to change things), but the resistor will not work. The gauge reads a signal that is either a box wave or saw wave, etc. The /4 gauge is calibrated to read the pulses in clusters of 4, the /6 in 6/. If you could find out what electronic component is different in the tach you could easily change it and it could only cost $.50. I may have to do this later. It depends on how my MJLJ works.
Sorry that I couldn't bee more help, but you can search based on what I told you and maybe find something. |
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| Britain Smith |
Feb 4 2005, 12:19 PM
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#6
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
Hey Trekkor, I have a early 911 tach that goes to 8K. I will sell it to you for the price I paid, I will have to check how much that was. I will actually be up in that area this weekend picking up a glider chair for the wife.
-Britain BTW: This is my 1000 post!!! (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif) |
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| Trekkor |
Feb 4 2005, 02:26 PM
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#7
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
I'm going to sport the MSD. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) ( mods already, I know, Nathan )
Sooooo, which 911 tach will I want to use that requires no mods? KT |
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| SirAndy |
Feb 4 2005, 02:35 PM
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#8
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Resident German Group: Admin Posts: 41,636 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
that's what i told him. but trekkor is not very good at "listening" ... (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) Andy |
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| Trekkor |
Feb 4 2005, 02:41 PM
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#9
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
WRONG! Brad must be with you. That's something he would say (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif) Decision made after listening, in just the last hour (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) Hmmmph.... (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) |
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| J P Stein |
Feb 4 2005, 03:55 PM
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#10
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Any of the "big wire" 911 tachs will work. I use a 71.
I think Dan said this before.....but you weren't listening (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif) They also work with an MDS6AL without an adaptor. The 6AL has a rev limiter. Summit Racin' for the best price. |
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| Dad Roberts |
Feb 4 2005, 06:38 PM
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#11
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Member Group: Members Posts: 224 Joined: 1-January 03 From: Ontario,Ca. Member No.: 70 |
Who are you talking to about recal. your tach? United Speedometer in Riverside did mine several years ago, but I don't remeber it bein near that much. I do know they can handle all VDO guages. (IMG:http://www.914world.com/bbs2/html/emoticons/driving.gif) ......Dad
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| Trekkor |
Feb 4 2005, 07:30 PM
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#12
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Palo Alto Speedo...
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| drew365 |
Feb 4 2005, 10:25 PM
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#13
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These are the good old days! Group: Members Posts: 2,004 Joined: 29-December 02 From: Sunny So. Cal. Member No.: 37 |
Here's my 8k tach. I had it calibrated for my Electromotive crank fire ignition. I don't remember what North Hollywood Speedo charged me. I seem to remember a thread on the bird board, one member was an electrical engineer and gave a detailed discription of how he recalibrated his tach for next to nothing in parts. Might be worth a search.
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| smrz914 |
Feb 4 2005, 10:48 PM
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#14
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Soon to be brightening the life of the person behind you. Group: Members Posts: 456 Joined: 21-April 03 From: Pleasant Hill, CA or Chico, CA Member No.: 596 |
You will have to do a little adjustment on some of the components. If you use a stock ignition then you don't need to change the input signal.
Tach Conversion |
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