Instrument Cluster Back Plate
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Laughing Gas
Joined: Dec 2000
Posts: 781
Likes: 18
From: East Texas
Instrument Cluster Back Plate
I removed the instrument cluster from my 1977 F-250 on Labor Day and the problem I suspected was confirmed. The back plate disintegrated on removal. I was fortunate enough to have been the high bidder for an entire cluster from a 1978 on EBAY.
Two questions: the speedometer in the 1977 was a 100 mph and the 1978 has an 85 mph speedometer. Will this speedometer function correctly as is in the 1977? Also, assuming the back plate on the cluster is in decent shape, is there anything I can do to avoid brittleness setting in? I'm assuming it's probably in pretty good shape as it's coming from Illinois and has not been exposed to the kind of heat in it's life that mine had as my truck has spent its entire life in Texas.
On a side note, I was so concerned over the instrument cluster predicament that as I backed out of the garage, I forgot that my wife's Subaru was parked in the driveway, and I managed to place a nice crease in the driver's side fender with the bumper of the truck. Needless to say, the instrument cluster problem didn't seem so bad after that.
Jason
1993 F-150 300 I-6 w/5-Spd.
1977 F-250 351M w/4-Spd.
Two questions: the speedometer in the 1977 was a 100 mph and the 1978 has an 85 mph speedometer. Will this speedometer function correctly as is in the 1977? Also, assuming the back plate on the cluster is in decent shape, is there anything I can do to avoid brittleness setting in? I'm assuming it's probably in pretty good shape as it's coming from Illinois and has not been exposed to the kind of heat in it's life that mine had as my truck has spent its entire life in Texas.
On a side note, I was so concerned over the instrument cluster predicament that as I backed out of the garage, I forgot that my wife's Subaru was parked in the driveway, and I managed to place a nice crease in the driver's side fender with the bumper of the truck. Needless to say, the instrument cluster problem didn't seem so bad after that.
Jason
1993 F-150 300 I-6 w/5-Spd.
1977 F-250 351M w/4-Spd.
Thread Starter
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Laughing Gas
Joined: Dec 2000
Posts: 781
Likes: 18
From: East Texas
Instrument Cluster Back Plate
Dennis,
Mine had all gauges and I happened to find one with all gauges. The total price including shipping was $39.51. I think it's a pretty good deal, but we'll see when it gets to me. The seller indicated the printed circuit board was in good shape. What was more important to me was that the back plate was in good shape as the circuit board is still available.
Jason
1993 F-150 300 I-6 w/5-Spd.
1977 F-250 351M w/4-Spd.
Mine had all gauges and I happened to find one with all gauges. The total price including shipping was $39.51. I think it's a pretty good deal, but we'll see when it gets to me. The seller indicated the printed circuit board was in good shape. What was more important to me was that the back plate was in good shape as the circuit board is still available.
Jason
1993 F-150 300 I-6 w/5-Spd.
1977 F-250 351M w/4-Spd.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Instrument Cluster Back Plate
All speedometers in the US are calibrated for 1000 revolutions per mile. Just pull your 100mph unit and put it in the 78 cluster. Some models had a different location for the high beam indicator so you will have to match your flex circuit with that also.
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