I purchased this cluster from a 74. It has oil and volts mine doesn't. It looks like the gounds are cut I will see if I can fix it but does anybody know where to buy a new one? Also can any body tell me if my 73 has the right sending units. These appear to be electric. It also has a fuel efficiancy gauge. Is this some kind of vac hook up?

The circuit part number is D5TF10848 AB
The instrument cluster plate number is D5UF10894 AB

 

If your current cluster has idiot lights instead of gauges you wont be able to do a direct swap. The wiring harness is different between gauge and non-gauge panels. The non-gauge plug doesn't have as many contacts as the with gauge plug.
The oil pressure sending unit is different between gauge and non-gauge panels, likewise, the alternator wiring harness is different between the two.
If you are talking about getting a replacement PC board several suppliers still have them. LMC and National Parts Depot to name a couple list them in their catalogs.
I've never heard of a "fuel efficiency gauge". I have seen an "economy" light before. It was an amber warning light that was vacuum operated with a sensor that was mounted on the firewall.
You may have gotten this unit from a '74, but from the two numbers you listed it is actually a 1975 unit.

 

Thanks for the info but now the inevitable question, how would I look at converting this? I would just like to know how to start. Your right it is a economy light. I didn't see a connection for a vac line so I assume it must be some kind of switch.
Thanks.

 

I swapped my 1979 out to guages from idiot lights and added a factory midship fuel tank. Find a truck same year and pull the entire harness with altenator wires, tag everything and swap. You will need to change your oil for sure and maybe temp sending units on the engine. I changed out fuse box with new fuses and cleaned all connections on plugs and fuse box. It took me about 3 hrs to pull and label the new old harness. about 2hrs to clean all contact surfaces and 6hrs to pull old and install new used harness it included a factory fuel switch on the heater control unit, every thing was a label and plug and play, it works great. I would also clean all grounds like fire wall to block ect.. I added a ground from the block neg battery cable to the frame and a cab to frame and a bed to frame ground, this is very improtant and will help ensure proper gauge function. good luck.

 

D5TF-10848-AB is the ID number for D5TZ10848A .. the original POS cluster back used 1975 thru 1979 on F100/350's, 1975/80 Econolines and 1978/78 Bronco's with oil and amp gauges.

This is not the same cluster as 1973/74 F100/350's used. 1973/74 clusters with oil and amp gauges are 1973/74 only.

D5TZ-10848-AB is the composition cluster back that can crumble to DUST before your very eyes.

The cluster back, printed circuit and gauges from a 1981/90 Econoline interchange with the 1975/79 F100/350, 1975/80 Econoline, 1978/79 Bronco cluster with oil/amp gauges.

In fact, Ford replaced the rotten cluster back with the 1981 (1981/90 Econoline) cluster back (E1PZ10848A) which is hard plastic and does not turn to dust.
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The cluster used on 1976/79 F100/350's, 1976/80 Econolines and 1978/79 Bronco's without oil/amp gauges is the same as 1981/86 Econoline's.

 

If I was to guess, probably a 1975 Year model with a build date between Aug. 74 and Dec. 74.

 

Nummberdummy I found a cluster back out of a econoline 1/2 ton van it looks just like the back in my 1979 F150 except the bottom takes three screws and the F150 has only one screw hole on the bottom. The number is E1UF-10848-AA, the numbers differ slighty from what you listed as an interchange will the one I listed work on my 1979? The plastic is different seems stronger.

 

I've never seen one in a 73-79 that was factory, is it an aftermarket install? it's essentially a vacuum gauge, it connects to full manifold vacuum (below the throttle blades).

 

I picked it up for 10 bucks on a chance it would work in my 73. It sounds like it wont. It most likely doesn't have any accuracy. Perhaps I should look at aftermarket.

 

The numbers differ because E1UF-10848-AA is an ID number, not an actual Ford part number.

No actual Ford part numbers appear on parts after 1956.

Numbers found on parts after 1956 are either casting or ID numbers.

E1UF-10848-AA = E1PZ10848A .. Cluster Back / Use with Oil & Amp Gauges.

This is the FoMoCo hard plastic replacement cluster back for: 1975/79 F100/350 / 1975/80 Econoline / 1978/79 Bronco.

Same as 1981/90 Econoline.

The original cluster backs were made from a composition material that can turn to DUST before your very eyes! I kid you not!
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montana_highboy: The fuel economy efficiency light is factory. These first appeared on some trucks/Econolines in 1976, after the first Arab Oil Embargo (1973/74) ended.

For those that are unaware, or are too young to remember the loong gas lines at filling stations, when the first Arab Oil Embargo ended, one gallon of regular gas went from roughly 25 cents a gallon nationwide to a buck a gallon.

Sounds cheap doesn't it. It was not cheap! Back then...a buck was worth 75-80% more than it is today!

btw: I've never seen or heard of an efficiency gauge itself...at least not on a FoMoCo vehicle.

 

Thanks ND, i've never come across one, thanks for the info.

 

The economy light has a switch that is mounted on the firewall. A vacuum line goes from the intake manifold to this switch.
When the intake manifold vacuum drops below a certain level, like during acceleration, this switch turns on the light mounted in the instrument cluster alerting the driver to back off. The idea was that the driver would accelerate more gradually, trying to keep the light off, thereby saving fuel.
In reality most drivers ignored the light.

 

Thanks for the insight, kind of ironic to have a "fuel economy light" in a dentside lol, i'll have to keep an eye out for that my next trip to the bone yard.

 

Another thing Ford did to increase fuel economy, was install Dana 44 rear axles in some 1977/79 F100/150's.

The usual ratio's available were 2.72-1 and 3.00-1.

The Dana has a puny rear axle capacity of 2900 lbs, compared to the 3300 or 3750 lb capacities seen with the 9's.

What did Ford do with passenger cars? Ford offered a 2.42-1 ratio on 1978/79's with 9 inchers.

This is...by far...the lowest numerically 9" axle ratio Ford ever offered.

Just think what the top speed would be if someone had a 1978 LTD Landau (we called 'em land yachts) with a 460 and a 2.42-1 ratio!

 

I had one of those "Low Fuel Economy" lights in my '75 highboy. No matter how hard you tried to keep the light from coming on, fuel economy didn't change. The light got to be annoying, so it was disconnected and plugged.