Electric Speedometer conversion for AD trucks

[chuckmc8]

Too hot to play in the shop yesterday with 'hard' work, so I tried this speedo conversion for electric conversions (LSx and 4l60e & 4l80e)

I took more pics along the process in case folks are interested in doing this for themselves. Keep in ming at this point I was just seeing if it would function and keep the guts inside the AD gauge case. It does- but to reset the odometer would require the press button to be outside the gauge. The circuit board is exposed on the back and would need a cover fabricated for it. The circuit board is not wider than the gauge itself.

If you are interested in doing this swap/conversion yourself- Time well spent would be to read through this thread on the 67-72 forum. There is around 14 pages or so and most of the details have already been worked out. My contribution here is simply adapting the speedo head into an AD gauge housing.

http://67-72chevytrucks.com/vboard/s...d.php?t=512751


I bought the donor gauge cluster on eBay. 1997 S10 without tachometer-I bought the cheapest one with shipping. ( circuit board on tach clusters are too wide and also do not have the odometer-so not a good choice for this conversion)

1997 S10 donor Cluster cost $25 with $12 shipping. I figured it was worth the risk. Most of this conversion engineering was worked out on the 67-72 forum- I just adapted it to the AD line.

I caused the mileage counters to read zero across the board and that took the longest to figure out. It doesn't matter but I want to have zero miles on my AD build. Now it has 3 miles since I temp wired in speedo into the floor in my 71 C10 with 6.0 and 4l80e for a test ride.

It wouldn't be very hard to have a 47-53 factory looking speedo decal made similar to the ones on eBay that cost $12 for a set- but the numbers would need to shift slightly and perhaps be a little smaller to fit the S10 sweep pattern. Maybe someone has that capability. I would like to make the shift indicator work with my Lokar floor shifter in conjunction with the shift indicator on the side of the 4l60e if someone know how to make that operate-

This speedometer seems to function properly going down the road by the 'butt' calibration method. Odometer works also. On my 71 test subject- I have the PCM programmed to the tire diameter and rear end differential ratio.

I can post more pics of the conversion process if anyone is interested.

There is space in the lower portion of the converted speedo to install turn signal and hi beam indicator LEDS or something else like a small short sweep tach

As it is-even if not particularly stylish- it functions as an electric speedometer for AD trucks for $37 and a couple hours time. With a new decal it could look more period and still be under $50. I know there are plenty of aftermarket gauges available but here is an inexpensive alternative for DIY folks.