Hi,

I've been dragging my feet on fixing these two problems for a while but I think it's finally time.

Temperature gauge - hasn't work as long as I've owned the truck. Reads all the way to cold and never moves.

Gas gauge - always worked great until a few months ago. Now it goes up and down and does whatever it wants randomly. When it first started going out I could jiggle wires behind the dash and I think it would go back to normal temporarily, but this may have been my imagination or wishful thinking since it was never that convincing. I've pulled and cleaned the connections at the gauge and sending unit and it didn't seem to make a difference. I haven't traced them all the way back to the tank though, so I suppose there could be a problem in the middle somewhere.

I read a bit about ICVR (instrument control voltage regulator if I'm getting that right) and it sounded like it could possibly be the cause to at least the issue of the gas gauge. What do you think?

Also, where on the Y Block is the temperature sensor? I poked around a fair amount and haven't been able to find it.

Thanks in advance y'all!

 

B9MZ-10804-C .. ICVR ~ Instrument Cluster Voltage Regulator (Motorcraft GR-508) / Obsolete - Available from auto parts stores.

Applications: 1957/66 F100/1100 / 1965/66 Mustang / 1966/77 Bronco and etc etc etc!

When this puppy begins to fail, the needles of fuel and temp gauges "do the hula" swing wildly back/forth on their own.

Since the temp gauge doesn't work at all, the defective ICVR is only affecting the fuel gauge.

B7A-10884-A .. Temperature Sending Unit (1/4" -18 pipe thread) is located in the cylinder head. It threads into an insert that either threads into the head or is a press fit.

Applications: 1957/62 F100/950 / 1957/59 Ford Passenger Cars / 1955/60 Thunderbird and etc.

 

Thanks Bill! I thought your signature said you were retired!

Could you give me some guidance as to where I can find the temp sending unit on the head? I'm wondering if it's maybe just disconnected or something stupid.

 

If it's not installed that would help explain why it's difficult to find. Look at the rear of the engine, drivers side, by the distributor.

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Awesome, thank you! Will report back!

 

Okay, times up...

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Out of curiosity, does the wire to the gas tank sending unit run under the cab floor?

 

Haha…got stuck at the race track all weekend. Stay in the holding pattern.

 

Mine goes up and over the door.

 

Actually I need to find a good source for the ICVR as the local guys can't get it for at least a week. Recommended online source to acquire one?

 

Radio Shack has the 7805 voltage regulator for about five bucks.

http://chris66dad.tripod.com/id29.html

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That looks slightly outside of my comfort zone

 

Nah. You wouldn't need the two caps. Center lead and tab is ground. I brought it up in case you have a rat shack close by, you could just pick one up.

Just asking, what leads you to believe you need to replace it?

 

The above. Gas gauge was bouncing all over the place while it was on its way out. Still moves around, but not as much as it did.

 

Yeah. I knew that already. lol how much are they quoting for that gem?

Have seen them anywhere from $25 to $40 or so.