Back on
Post #172, I wrote of using the more-modern donor Cherokee internals in the stock Willys housing and mentioned, "More on that in a bit".
It was really somewhat of a fiasco for a while; not the mechanical side of things, that went quite well actually. The Cherokee Speedometer, Temperature, and Fuel gauges all fit in the stock gauge case with little more than drilling some mounting holes for the new mechanisms and some slight grinding. I should have taken some pictures of the process.
The only difficulty we encountered was removing the needles from donor Fuel and Temp. They were sufficiently glued (or pressed) to the center pin that the rotating pin pulled out of the fuel gauge with the indicator needle, rendering it useless. We ordered a new one (under $30 delivered, I think) but used one from a Wrangler since the needles can be removed and installed with finger pressure and are of the same physical size and 0-88 ohm scale as the Cherokee sending unit.
A noted difference is the Willys Fuel & Temp gauge needles are read from the underside of the arc. If we followed this needle-pointing-down convention with the newer gauges, they would have read backwards, (i.e. Cold on the right of Hot, Empty on the right of Full). You can see we chose to install the newer mechanisms in their normal-to-factory-installation, arc-on-top configuration.
The Speedometer needle does not hit the Temp needle when dead-cold and stopped since it sticks out further from the face.
The "fiasco" came in with our chosen method of "calibration". We knew at first glance that the Cherokee & Willy speedometers had different zero's and scaling. First thoughts were to go the standard speedo-drive-gear changeout, but since the printed scaling would never match between old and new, our solution was to cut a cirlce from from a piece of lexan for a face-back and have a vinyl decal printed. We'll want it the size of the large Willys face but with the numbers printed to match the radials of the smaller Cherokee face. No brainer.
We brought both faceplates to the local
Sign-a-rama, and said
"
We want this [the Cherokee] face printed on this [the Willys] size circle in this [the Willys] font."
"
We can to do that.
That's easy!" said the girl behind the counter, "
We'll email a proof for you to authorize and then we'll print it"
"
Cool!" We walked out with a smile.
Almost two weeks later I'm calling them.
"
Oh, I'm sorry.
We've been busy. We'll get it out to you in a day or two."
I'll spare you all the sordid details but our first proof was just the Willys face copied, period. Send it back with a very polite translation of "Nope, You have two of our gauge faces for a reason. It wasn't to copy just one."
"
Oh yeah. That's right! I'm sorry."
Various emails and phone calls ensued. Proofs were honestly less than High-Schooler-learning-to-use-a-program quality. Many excuses. Repeated apologies.
Six weeks with
no changes to our original design/discussion but 13 proofs later, I'm in the middle of another exchange on the phone and Jack chimes in with,
"
Dad. They don't deserve our business."
God I love him!
I sat down at the same PC on which I'm typing now, an older steam-driven model with nothing more than stock software and I make a white-on-black-circle version of what you see in the picture above... with the intent to take it to Office Max or Kinkos for commercial-quality finalization & printing.
"
Here's your proof, sir." I tell him.
"
I think it would reflect the gauge lights better if the background were white." is his reply.
Click "negative" to reverse the colors. Poof! White background / Black numbers. Hit print.
"
It looks too modern like this." he says, "
It really doesn't fit."
"
Customers!" I rail back sarcastically as a pull some leftover, resume, parchment-looking paper from the drawer and slide it into the printer.
Third time's a charm.
"
Perfect!" He's grinning.
Well.. almost.
After a period of days we elect to change the tick marks to stars and such, but the design was approved and the Constitution-paper version was installed into the gauge to take a ride down the road, verifying that I really got the numbers were they should be for speed. That's what you see here, plain paper.
I've got the digital file to take anywhere I want for printing while he can see what he needs to while driving.
I'm going to cut another back for the real deal since I missed the mark on aligning the blinker indicators below the 1 and 8, but that's as difficult as cutting and drilling an 1/8" piece of plastic. I'll just be more precise with my layout now that we have successful proof of concept.