Speedometer For Getrag 5-speed

opelgtboy70 · 04-05-2007

The 5 speed is in. I replaced the speedo gear with the one from opel gt source. Why do I have to use a different speedometer? Will it work with the 5 speed and just be off in the mph's?

Karl
70 GT

wolf32 · 04-05-2007

Who said you have to use a different speedometer

opelgtboy70 · 04-05-2007

Opel GT source said I have to change to a different year speedo.
Speedo # 1062

opelgtworld · 04-06-2007

Speedometer drive gear
Number of teeth:
red 18
yellow 19
blue 20

Which you need, depends from the speedometer, the transmission,the rear axle and also on your wheels.

Tacho-Berechnung und Endgeschwindigkeiten - Rüdiger Cordes

markandson · 04-06-2007

With out the proper speedo you will not get accurate MPH reading. The gearing inside the speedometer must be different from the suggested one to the one you have in your car.

soybean · 04-06-2007

Karl, Here is a single post about after the swap.
Here is a thread. Check post nos.9.
Hth, Jarrell

Crazy Harry · 04-06-2007

Karl,

The speedo will work, but the MPH will be off if the components don't match and the from my experience the difference is significant between a W=897 and a W=1062. If the speedo reads the wrong MPH then the odometer will be off too!

It would be best to match the speedo with the proper transmission take-off. According to "opelgtworld" you may get away with changing the speedo take-off gear at the transmission rather than changing the gauge in the dash. The speedo converts the speedo cable rpm to the gauge readings. Changing the take-off gear at the transmission matches the speedo cable rpm to the gauge head calibration. I haven't tried changing the speedo or the transmission gear so I couldn't tell you which is easier, but I'm guessing the transmission end might be the way to go if you can get the right color gear.

The link "opelgtworld" gave is good, but remember you need all the right info and those calculations are metric, km/h. The conversion for the W number is mentioned in the fine print, about 1.6 km/mile. For a W=1062 in MPH the W you would use in the link is 660, the table shows the conversion between MPH and km W numbers.

Sorry for the rambling reply, hope it helps.

"opelgtworld": Viele Dank für den Link! Thanks for the link!

Regards,

Harold.

jerseydave · 04-06-2007

Karl

I have an extra W-1062 speedometer I just got a few weeks ago off of ebay.
Price was good and wanted to have a back up! Let me know if your interested.

opelgtboy70 · 04-06-2007

OPGTS sent me the correct tranny gear (plastic piece). They also told me to switch to the 1062 speedo. I was wondering why I have to switch both.

Karl
70 GT

baz · 04-06-2007

so they match

GTJIM · 04-06-2007

Here is a link to the math:

http://www.opelgt.com/forums/1e-othe...eedometer.html

04-05-2007	#1 (permalink)
opelgtboy70 Opeler Join Date: Mar 2003 Location: NJ Posts: 201 Real Name: Karl Senula	Unanswered: Speedometer For Getrag 5-speed The 5 speed is in. I replaced the speedo gear with the one from opel gt source. Why do I have to use a different speedometer? Will it work with the 5 speed and just be off in the mph's? Karl 70 GT

04-06-2007	#4 (permalink)
opelgtworld www.opelgtworld.de Join Date: Feb 2004 Location: Germany Posts: 327	Speedometer drive gear Number of teeth: red 18 yellow 19 blue 20 Which you need, depends from the speedometer, the transmission,the rear axle and also on your wheels. Tacho-Berechnung und Endgeschwindigkeiten - Rüdiger Cordes __________________ "Man kann ein Auto nicht wie ein menschliches Wesen behandeln - ein Auto braucht Liebe. (Walter Röhrl)"

04-06-2007	#6 (permalink)
soybean Moderator Join Date: Nov 2002 Location: Reidsville N.C. Posts: 2,160	Karl, Here is a single post about after the swap. Here is a thread. Check post nos.9. Hth, Jarrell __________________ You lose your dreams, you lose your mind. (The Rolling Stones)

04-06-2007	#8 (permalink)
jerseydave Member Join Date: May 2004 Location: New Jersey Posts: 692 Provided Answers: 1	Karl I have an extra W-1062 speedometer I just got a few weeks ago off of ebay. Price was good and wanted to have a back up! Let me know if your interested. __________________ Dave 73 Opel GT-work in progress 74 Manta 75 Manta Previous 72 Manta Rallye-owned 1974-1979

04-06-2007	#10 (permalink)
baz opel free after 26 years Join Date: Jun 2002 Location: sunderland england Posts: 4,941 Real Name: barry williams Provided Answers: 4	so they match __________________ Copyright © 2003-2009 barry williams All Rights Reserved save praying to God for sunday today we pray to Nike and run like hell

04-05-2007	#2 (permalink)
wolf32 Opeler Join Date: Jun 2005 Location: Georgia Posts: 63	Who said you have to use a different speedometer

04-05-2007	#3 (permalink)
opelgtboy70 Opeler Join Date: Mar 2003 Location: NJ Posts: 201 Real Name: Karl Senula	Opel GT source said I have to change to a different year speedo. Speedo # 1062

04-06-2007	#7 (permalink)
Crazy Harry Opeler Join Date: Jan 2007 Location: Oakville, Ontario, Canada Posts: 94 Real Name: Harold Provided Answers: 1	Karl, The speedo will work, but the MPH will be off if the components don't match and the from my experience the difference is significant between a W=897 and a W=1062. If the speedo reads the wrong MPH then the odometer will be off too! It would be best to match the speedo with the proper transmission take-off. According to "opelgtworld" you may get away with changing the speedo take-off gear at the transmission rather than changing the gauge in the dash. The speedo converts the speedo cable rpm to the gauge readings. Changing the take-off gear at the transmission matches the speedo cable rpm to the gauge head calibration. I haven't tried changing the speedo or the transmission gear so I couldn't tell you which is easier, but I'm guessing the transmission end might be the way to go if you can get the right color gear. The link "opelgtworld" gave is good, but remember you need all the right info and those calculations are metric, km/h. The conversion for the W number is mentioned in the fine print, about 1.6 km/mile. For a W=1062 in MPH the W you would use in the link is 660, the table shows the conversion between MPH and km W numbers. Sorry for the rambling reply, hope it helps. "opelgtworld": Viele Dank für den Link! Thanks for the link! Regards, Harold.

04-06-2007	#9 (permalink)
opelgtboy70 Opeler Join Date: Mar 2003 Location: NJ Posts: 201 Real Name: Karl Senula	OPGTS sent me the correct tranny gear (plastic piece). They also told me to switch to the 1062 speedo. I was wondering why I have to switch both. Karl 70 GT

04-06-2007	#11 (permalink)
GTJIM Old Opeler Join Date: Jun 2003 Location: New Zealand Posts: 5,686 Provided Answers: 12	"W" numbers Here is a link to the math: http://www.opelgt.com/forums/1e-othe...eedometer.html __________________ GTJim Opel Owner since last Century! Copyright © 2000-2009 J D Henry All Rights Reserved

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