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914World.com _ 914World Garage _ How to or do you know how to convert a tach

Posted by: 736conver Oct 18 2005, 02:36 PM

How can someone convert a tach to run on a different engine. I have a pre-84 911 Tach that I need calibrated to run on my 87 911 engine with DME.
I called North Hollywood and they want $180 to do it. Has anybody recalibrated one?

Posted by: Ferg Oct 18 2005, 03:25 PM

Nope I just found a 87 tach, and bought it. They pop up on ebay.

Ferg.

Posted by: Cap'n Krusty Oct 18 2005, 03:25 PM

QUOTE (736conver @ Oct 18 2005, 12:36 PM)
How can someone convert a tach to run on a different engine. I have a pre-84 911 Tach that I need calibrated to run on my 87 911 engine with DME.
I called North Hollywood and they want $180 to do it. Has anybody recalibrated one?

Obviously THEY have .................. The Cap'n

Posted by: 736conver Oct 18 2005, 03:29 PM

I have been checking ebay but nothing lately. I've call around to EASY, DC auto and some others but it seems they are all out.

Posted by: Ferg Oct 18 2005, 03:32 PM

Call Matt at Carquip, he's a member here, and I bet they have one.

303 443 1343

Ferg

Posted by: 736conver Oct 18 2005, 03:40 PM

Thanks, I'm calling now.

Posted by: Matt Monson Oct 18 2005, 04:02 PM

Brian,

Sorry but we've got a handful of 3.0l tachs, but no 3.2's. I don't think a 3.0l would work without recalibration...

Posted by: Ferg Oct 18 2005, 04:29 PM

Bummer, ok then, call Dave at Dartauto

303-296-1188

Ferg

Posted by: goose2 Oct 18 2005, 06:25 PM

Partial hijack for a related question: I'll be switching from a points/coil 3 pin factory CD box ignition on a 2.4 six...to a breakerless/coil 6 pin factory CD unit on a 3.0. Will I need to change tachs?

Posted by: Wild 6 Oct 18 2005, 08:42 PM

I run a modern 3.6L and an old original 914-6 tach. You need to get a MSD 8920 Tach Adapter. Its converts the modern digital signal back to a high voltage pulse.

Pelican Parts: $71
Summit Racing: $48

Posted by: joea9146 Oct 18 2005, 09:13 PM

Did u check the 911 classified ads on www.pelicanparts.com

Posted by: 736conver Oct 19 2005, 11:02 AM

Well I tried about all the Porsche resources for a gauges no luck. There is someone on ebay that sells them for $250 but I think at that price I will just have mine sent to NHS for $180.

Posted by: JOHNMAN Oct 19 2005, 11:22 AM

Did you try Oklahoma foreign? I have always had excellent results with them.

800-462-2446 ask for Gary

Posted by: 736conver Oct 19 2005, 12:28 PM

I just sent it off to NHS. Parts Heaven had one but it was $270. They all seem to be over $250 if you can find one.

Posted by: DrifterJay Oct 19 2005, 04:42 PM

Crusty, get fucking real.... ahole....lol...

Posted by: Steve Oct 19 2005, 09:15 PM

How about silver star recycling??
I think I paid $100.00 at silver star.

Posted by: 736conver Oct 19 2005, 11:27 PM

I tried all the salvage places I could think of. Everybody was out or over $250.

And now its already been sent out to NHS. I know I will have a good refurbished Tach.

Posted by: 914efi Oct 20 2005, 05:13 AM

I've done a few of these by buying a cheapo tach from pep boys and installing the movement into the 911 case. There is minor cutting of the back of the case, but it works for about $30.00. Just make sure you get one with the correct sweep angle.

Posted by: kdfoust Oct 20 2005, 09:14 AM

QUOTE (Wild 6 @ Oct 18 2005, 06:42 PM)
I run a modern 3.6L and an old original 914-6 tach. You need to get a MSD 8920 Tach Adapter. Its converts the modern digital signal back to a high voltage pulse.

Pelican Parts: $71
Summit Racing: $48

Is there any downside to the MSD device? I'm facing the same conversion any second now.

Later,
Kevin

Posted by: 736conver Oct 20 2005, 10:46 AM

QUOTE
Is there any downside to the MSD device? I'm facing the same conversion any second now.
Kevin I searched this over on the bird board and lots of guys were having problem with it.
it sounds like 914efi has a good idea about getting a tach from pep boys. I would of tried that but its too late now my gauge is halfway to NHS.

Posted by: Series9 Oct 20 2005, 10:57 AM

Any tach from '84 to '98 will work. I have a 993 tach that's electronically stabilized which is really nice because it doesn't bounce.

Posted by: 736conver Oct 20 2005, 11:16 AM

QUOTE
Any tach from '84 to '98 will work. I have a 993 tach that's electronically stabilized which is really nice because it doesn't bounce.

Thats a bummer I thought I could only use the 84 to 89 for my 3.2. I found alot of tachs for sale that were 90 and newer.
So why can I find the 90 and newer tachs $100 cheaper then the 84-89 if they work with the 84-89 engine.

Posted by: Steve Oct 20 2005, 10:27 PM

The needles on my 993 gauges look diferent than my 1984 tach.
They have a white outline down the sides.