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I Can't See All My Gauges!
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Fri Oct 02, 2009 6:52 am    Post subject: Reply with quote

Got some gauges on there way to me. We will see when they arrive! I havent seen the PCB close up, it may be a multi layer board, in which case you wont trace them! The econogauge itself will just be a moving coil meter. once i know what kind of voltage gives full scale deflection, i could then look at designing my own circuitry
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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Jakkq  



Joined: 29 Sep 2008
Posts: 809
Location: Norfolk, Nebraska

PostPosted: Fri Oct 02, 2009 7:36 am    Post subject: Reply with quote

You should join our SpeedHut group buy!

http://www.924board.org/viewtopic.php?t=29989
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Fri Oct 02, 2009 7:59 am    Post subject: Reply with quote

Thank you kindly hon but I like the retro 80s look of the stock yellow on black 944 gauges plus,.. got better things to spend £65 ($100) on.

I want to pass my bike test and build me a low rider! (before I get too old!)
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Wed Oct 07, 2009 8:58 pm    Post subject: Reply with quote


Does anyone know how to open the tack without damaging it?



lucky with the millage on these new clock hay?

this is the one in my car at the mo


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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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joecitizennn  



Joined: 12 Sep 2005
Posts: 2096
Location: no mans land

PostPosted: Wed Oct 07, 2009 10:44 pm    Post subject: Reply with quote

9XX Girl! wrote:

Does anyone know how to open the tack without damaging it?



Yeah, you have to work your way around the metal band bending it open on the back till you can pull it off. A small screwdriver or a very thick knife blade works. To re-assemble you simply squeeze the metal back down.
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Wed Oct 07, 2009 10:51 pm    Post subject: Reply with quote

hmm.... taught as much. was hoping for an easer option but will give it a go when I'm feeling patent and methodical. no good me trying unless I'm in the zone.
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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ideola  



Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI

PostPosted: Wed Oct 07, 2009 10:58 pm    Post subject: Reply with quote

Yeah, it's kind of a PITA. Be careful that you don't cut yourself on the sharp metal edges.
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Wed Oct 07, 2009 11:00 pm    Post subject: Reply with quote

It's hard work and be careful it's easy to slip. Also beware of damaging the front face of the bezel it's easy to bend when finally prising it off.

I found a small electrical screwdriver was best but a bigger one was quicker! Once the bezel is off straighten the prised out lip with pilers so it goes back together easier.

Bending it back over - I just pinched it in a few places so that next time was easier to get into.

Rich
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Wed Oct 07, 2009 11:09 pm    Post subject: Reply with quote

Thanx guys! will give it a go when i come home from work this eve.
I got a first aid kit so i'll be OK! if you don't here from me by tomorrow it means I've bled to death.
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Oct 08, 2009 12:28 am    Post subject: Reply with quote

Don't forget to take pics!
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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Jakkq  



Joined: 29 Sep 2008
Posts: 809
Location: Norfolk, Nebraska

PostPosted: Thu Oct 08, 2009 5:03 am    Post subject: Reply with quote

Pics or it didn't happen!
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Shurick  



Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.

PostPosted: Thu Oct 08, 2009 5:57 am    Post subject: Reply with quote

I haven't been sitting in my 924 for a while but... I can't remember any problems with temp gauge readings. I'm above 6 ft tall so my line of site is rather high. And no problems. What I've been doing wrong?
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WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Thu Oct 08, 2009 11:02 am    Post subject: Reply with quote

Shurick which side is your steering wheel? Mine is on the right side.
_________________
924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Thu Oct 08, 2009 12:19 pm    Post subject: Reply with quote

OK then.
this is a poor quality photo of the tach being opened.





This is the back of it once open.
The moving coil part of the econogauge has two wires, Green and White connected to it.
I have removed the one at the top (white) and left the one at the bottom (Green) still connected.
I have clipped a test lead to the bottom terminal.





This is the front without any voltage applied




On this pic below, i have used the other end of test lead and a slightly
flat 1.5volt AA battery (1.2v) to apply power to the top terminal.
This gives Full Scale Deflection (FSD). The needle doesn't go hard
over but does strike the full scale stop, therefore i am gona flatten (discharge)
the battery by 0.5v increments until it gently makes the stop.
This should give me correct FSD Volts,



Once i have the FSD Volts and the pinout data for a vacuum MAP sensor,
i can calculate the correct resistor values for a potential divider circuit (with trim pot for calibration),
to convert the 5volts at 0.1mmHg of vacuum to FSD Volts that will power the moving coil meter,
thus creating an electrical vacuum gauge A.K.A econometer

_________________
924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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Shurick  



Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.

PostPosted: Thu Oct 08, 2009 4:32 pm    Post subject: Reply with quote

9XX Girl! wrote:
Shurick which side is your steering wheel? Mine is on the right side.

Sorry, missed that.
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WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/
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