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I'm working on a 75 F250 High boy. It originally had a 360 2 V but is now a 390 4V. It has this part mounted on the firewall
and I'm trying to find out what it is.
It's unplugged from the wiring harness and only has I vacuum port, so I think it may be a bleed off valve of some kind.
Also the blue color suggests that it may be related to the intake air temp controls because there is a component on
the air cleaner the same color.
Thanks and best wishes!
Last edited by Reanm8er; Jan 18, 2020 at 06:37 AM.
Reason: typo
It's a 75 only thing- it was a simple vacuum switch that runs the low fuel economy light. When the vacuum drops too low (i.e. you have your heavy foot on the fun pedal), the light comes on. Mine was disconnected from vacuum but still connected on the wiring so my light is on all the time. Seems appropriate and makes me laugh to myself a lot, so I left it that way.
It's a 75 only thing- it was a simple vacuum switch that runs the low fuel economy light. When the vacuum drops too low (i.e. you have your heavy foot on the fun pedal), the light comes on. Mine was disconnected from vacuum but still connected on the wiring so my light is on all the time. Seems appropriate and makes me laugh to myself a lot, so I left it that way.
I had something similar to that on my old '75. I had the engine rebuilt with some more performance and because of that it produced less vacuum, so the light stayed on all the time. Prior to that it really didn't need much pedal to make it come on, so I probably never lost that much vacuum over stock after the rebuild.
Thanks wyrm, I'd never heard of such. Now I'll have to plug it in just to see where the light is. LOL
Having just put a Holley 4160 back on it I should probably add a piezo buzzer!
Thanks Doosenberry, I don't know what cam was put into the 360 with the 390 stroker kit but 4 gals of mogas
only provides several trips back and forth my back road. But then the joy factor is demanding. I know with 87
octane in it I only ventured 6 degrees before. It'll climb a 30 degree hill at 20 mph at full throttle without pinging.
More research is pending!
Thanks wyrm, I'd never heard of such. Now I'll have to plug it in just to see where the light is. LOL
It is the yellow light on the right side of the instrument cluster between the ammeter and the temp gauge, assuming that it is still the original cluster. Other years had different other lights in the same location (brake light switched to right and seatbelt light on left on later years IIRC, not sure abut 73-74).
It is the yellow light on the right side of the instrument cluster between the ammeter and the temp gauge, assuming that it is still the original cluster. Other years had different other lights in the same location (brake light switched to right and seatbelt light on left on later years IIRC, not sure abut 73-74).
Thanks Wyrm, I like the blue needles too. They don't seem to show signs of being painted?
It's a SUPER RARE option package, 1 of 1 made as far as I know. OK, they are painted.
I got the paint from these guys. They have several other color options too and it's only $3 for a small jar that will probably do 20-30 gauges or more. I thought it would match well with the blue LEDs I used, but it was really hard to see the needles at night. I was thinking it might help to switch to white LEDS, but I would have had to order some and then I realized that UV would be practically guaranteed to work because it makes fluorescent paint glow. I was looking for UV bulbs, but couldn't find any in the correct socket so I finally just ordered some strip lights off Amazon and tied them into the low fuel economy light since it is always on as mentioned before. It works well enough (the picture above is with the UV strips turned on, for comparison the picture below is with them off). I love it during the day, but the jury is still out if it is too bright at night or not. Maybe I should take the blue LEDs out and see if that helps, but I'll probably just leave it as-is until I can afford the Dakota Digital cluster.
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