#1  
Old 10-07-2021, 04:19 PM
4 SPEED GOAT 4 SPEED GOAT is offline
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Default 1970 FIRE BIRD FORMULA FACTORY TACH AND GAUGES

I AM LOOKING FOR A SET OF FACTORY TACH AND GAUGES FOR MY 70 FORMULA.I WOULD LIKE TO HAVE A SET FROM A 1970 CAR AS I KNOW THERE ARE SOME DIFFERENCES.

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Old 10-08-2021, 12:19 PM
poncho-mike poncho-mike is offline
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There was a set of 1970 tach and gauges advertised on Facebook, but they were pricey. I think 1970 & 1971 are the same, the connector on 72 up was different.

Do you know how to tell one set from another?

Mike

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Old 10-16-2021, 01:47 PM
70 Blackbird 70 Blackbird is offline
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The tach on a 70 has the single wire tach signal connector.. rather than the later year with a 2 pin (power and tach signal) connector.

At some point the temp gauge went to the 220 midpoint value.. but I don't believe that was exclusive to the 1970 model.

Both the 70 and 71 have the single "BRAKE" light on the speedometer.

  #4  
Old 10-16-2021, 10:46 PM
poncho-mike poncho-mike is offline
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I also think the connector on the 70 & 71 was different from the 72 and up.

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Old 10-17-2021, 06:47 PM
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unruhjonny unruhjonny is offline
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So everyone (not just the OP) can see it here's what makes 1970 gauges unique:
  1. housings; the housings are 1970-1972 - they are the same if they are for either rally gauge set; the clock and tach's each use a different rear cover that completes the housing; the housings changed mid 1972 when the seat belt minder was added.
  2. the speedo's are 1970-1972, just like the housings, the speedo changed when the seat belt minder was added.
  3. the oil/water gauge changed in either 1973, or for the 1974 model year (I cannot recall, but believe it has been spelled out here elsewhere); the early ones have the middle water temp reading as 210, while the later ones (lets call them 1973-1979) had the middle temperature reading as 220. I seem to recall reading that 1973 gauges had the 210 reading.
  4. fuel gauges; the fuel gauge is a 1970-only thing, as the originals have a red/orange area in the last quarter tank (near "E") - this coloured zone was removed for 1971; the other fuel gauges are 1971-1974. Then in 1975 the large "FUEL" was replaced with a smaller font "UNLEADED FUEL ONLY" - that gauge is 1975-1979.
  5. This is the last difference, and it's so small that I personally wouldn't sweat it; tach's - the original 1970 tach's are a one year only unit, which only have a single lead for a points distributor. The 1971-1976 tach looks exactly like the 1970 tach, except a second lead (reads "12v") was added for the electronic distributors. For 1971-1974 you could get an electronic distributor (Pontiac's version of an HEI) which is why the tach was changed.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #6  
Old 10-18-2021, 08:33 AM
SD455DJ SD455DJ is offline
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As mentioned by Unruhjonny, there are physical differences in the housings and to add to Jonny's list. The 70-early thru 72 had 12-pin harness connection slots while the late-'72 up had a 16-pin slot. Also, the clock adjustment knob is black on 70-71, chrome on 72-up...I believe.

Dennis
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