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Unread 02-05-2011   #1 (permalink)
Bruski6595 is offline Apprentice

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Question 1983 Mustang GT tachometer question

Good morning folks,
I want to swap gauge parts or the gauges themselves, which ever will work.
GT GAUGES work fine. The faces just aren't as crisp as my donor dash has.
Donor dash had convertible switch, and the (warning) lights on the left side had "turbo" as one of the lights.
I'm presuming this had to be a 4-cylinder donor dash.
I did a search about the tachs and all talked about the switch for the 4-6-8 cyl use. I see where the switch would go, however, it is just a hole...nothing to do the actual switching, unless disassembly is required.
I was going to just swap the face and needle, but, knowing what forcing things can do, led to the question...how do I get the tach needle off the stem?
That led to another question...will the 4 cyl tach work on an 8 cyl model. It seems like it would read either half the RPM's or probably double.
Any help is certainly appreciated. I hate to wreck perfectly good parts.






:?:
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Unread 02-05-2011   #2 (permalink)
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Will not work and you can just pull the needle off carefully.
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Unread 02-05-2011   #3 (permalink)
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Quote:
Originally Posted by Bruski6595 View Post
how do I get the tach needle off the stem :?:
Take a kitchen fork and side it under the needle and between the stem ... gently lift upward.
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Unread 02-05-2011   #4 (permalink)
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OK...seemed to be what needed done, but needles weren't cooperating...thanks for the response's.:kooky:

The sig that isn't listed yet would be...1983 GT, hatchback,5 speed, dark red, black and red interior, in pieces...you know how projects go!...lovin it...3.73's waiting sub-frame connectors waiting...floor repairs on the list too...steerin wheel needs new leather. It all gets me excited.
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1995 coupe, 5-speed, bright blue, black & grey interior, home made rear seat delete for the pooch, 180 degree thermostat, Billet quadrant, adjustable clutch cable, firewall cable adjuster, billet headlight knob, Cobra shift knob, Energy Suspension front sway bar bushings, plug and
play OEM fog lights and switch.
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Unread 02-05-2011   #5 (permalink)
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Quote:
The sig that isn't listed yet would be...1983 GT
That being said, you can swap guages from a 79-86 foxbody no problems.
Quote:
left side had "turbo" as one of the lights
They all did.
Quote:
I see where the switch would go, however, it is just a hole...nothing to do the actual switching, unless disassembly is required.
Look on your donor tach....its a white plastic piece about the size of a pencil eraser with a slot in it for a flat head screwdriver. Can be easily swapped by loosening just one screw on the tach. It will read your RPM's correctly, just turn it to the 8.
Quote:
how do I get the tach needle off the stem?
Gently pry it off. The fork idea is good. But, if you are swapping guages, why do you need the neede off?
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Unread 02-06-2011   #6 (permalink)
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Thanks for bringing these to light.
I will check the dash face from me 83...I don't remember turbo being there.
Both tach's seem to be missing the "eraser".
If I knew that the donor tach was from a v8 car, I wouldn't have to be concerned about the needle coming off to get the faceplate, I could just swap the whole thing. I hate to get it together and then take it apart again. The donor dash gauges are in much better condition.
I can say the donor dash has a date on the back side of 85, and it is a dark charcoal (grey), and the face looks a bit modular in that it looks like there are covers that unscrew (but don't). Would that help identify a specific model?
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1995 coupe, 5-speed, bright blue, black & grey interior, home made rear seat delete for the pooch, 180 degree thermostat, Billet quadrant, adjustable clutch cable, firewall cable adjuster, billet headlight knob, Cobra shift knob, Energy Suspension front sway bar bushings, plug and
play OEM fog lights and switch.
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Unread 02-06-2011   #7 (permalink)
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^ Yep. If the donor instrument cluster cover is gray and has what looks like allen screws on it , then its out of an 85 or 86. If you can find a tach cylinder # button (the eraser) an install it, then it will work regardless of what it came out of. If I recall correctly, you can swap from 4-6-8 even without that button. Between 79-86, Ford put several different tach configurations in the Mustangs. I had a 79 Cobra with an 8,000 RPM tach. Most differences were max RPM and red/yellow lines. Don't forget to match the odometer mileage to your original car if you swap the entire cluster and your car is not mileage exempt. Hope this helps.
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Unread 02-06-2011   #8 (permalink)
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Thanks again for the reply. Good info too. I'll look for one of those pieces to change the tach. My salvage yard guy has nothing but mustangs. I go insane when I get there. He may be able to help me.
Would there be an electrical test I might be able to use to see what position it is currently set to?...just a thought.
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1995 coupe, 5-speed, bright blue, black & grey interior, home made rear seat delete for the pooch, 180 degree thermostat, Billet quadrant, adjustable clutch cable, firewall cable adjuster, billet headlight knob, Cobra shift knob, Energy Suspension front sway bar bushings, plug and
play OEM fog lights and switch.
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Unread 02-06-2011   #9 (permalink)
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My tach in my 86 had the switch but it didn't work for v8 when I swapped. I took the tach out and it was missing the resistors so I counted that in 4cyl it was at 144k ohm so in the empty spots where the v8 resistors went I pit 77k worth of resistors and now it works great. It works the same with the 8k resistors because that's where I got the idea for mine. Just search. Radio shack had resistors there the 1/4 watt ones
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Unread 02-07-2011   #10 (permalink)
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Thank you...didn't think of checking that out, but I will.
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1995 coupe, 5-speed, bright blue, black & grey interior, home made rear seat delete for the pooch, 180 degree thermostat, Billet quadrant, adjustable clutch cable, firewall cable adjuster, billet headlight knob, Cobra shift knob, Energy Suspension front sway bar bushings, plug and
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