with the formula in the link , you should be able calculate what resisters to add in parallel to get full sweep . easier than disecting a sending unit me thinks??
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later...rog
AADD supporting member !!
I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!
I find the generator is not extremely accurate. The dial has numbers on a "clock" face and I tested it first with my digital meter. Then I noted the values and adjusted the numbers so that the numbers shown above are accurate. Depending where you are on the scale, the generator is about 6 ohms lower than acutal.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
I've been through all the buyers guides etc that the jobbers have. I searched columns and columns for all makes. I found one that is not bad, I think it was 45 ohms @ 60 psi but that is still way too much. If I'm going to rewire the little resistor plate anyway, I don't think it matters if I start with an 100 ohm or 60 ohm anyway. I just unravel the wire, find where 35 ohms is on the wire and then re-wrap it around the plate with only that length wire instead of the much longer wire.
I'll try to post pictures once it's done.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
with the formula in the link , you should be able calculate what resisters to add in parallel to get full sweep . easier than disecting a sending unit me thinks??
Rog, I read one thread over on PY where someone posted that using resistors on a higher ohm unit never quite solved it.
I'm tempted to try it though. Easy to test if it would work.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
A resistor will add base resistance through the entire scale so you could make it exactly correct at one point but it would be off at points away from that mark. ie. starting with a 0-25 sender... adding a 10 ohm resistor would net a 10-35 ohm performance. so instead of 0 you still have the resistor in the circuit. The gauge would then start at 17-18 psi (10 ohms) and end correctly at 60.
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72 Nova SS - Minitubbed 70 Nova SS - #'s L-78 Bench Stick 68 Acadian SS clone - factory air 67 Chevelle rag - SS 427 clone
I wasn't sure but I kinda figured it would work out that way.
I think I have figured out how to rewire an existing sender that will make it accurate. I just need to find really thin sheets of plastic for the block to wind the resistor wire on.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
I wasn't sure but I kinda figured it would work out that way.
I think I have figured out how to rewire an existing sender that will make it accurate. I just need to find really thin sheets of plastic for the block to wind the resistor wire on.
Got you covered on the plastic, I'll bring you some on Saturday.
TodayI bought myself a nice ratcheting crimper for doing the factory style wire ends.
The cluster is ready to put in now, all connections done. It's a plug and play now. All tested except the oil gauge because I haven't installed the correct sending unit yet.
Just can't put it in yet. First have to put in the tach, reverb switch, power antenna switch and AM/FM.
As simple as plug in, put cluster in position, install 2 bolts and 2 nuts that hold it in, and "Bob's your uncle".
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
Hey Carl just for info's sake since i've got mine hooked up and running quite a bit I've been finding the oil pressure works great and seems pretty accurate as compared to the old aftermarket one that was in there. However the temp gauge goes up to the hot end very quickly even though the engine used to run at a nice 180-190 with the aftermarket one.
It's not impossible but it was supposed to be correct.
One thought I had is that the temp gauges likely show hot sooner on the old gauges than the new ones. In the 60's, "hot" was considered to be about 200 I think, with 212 being max that was safe. I think the factory thermostat in our cars was a 160 degrees.
Have you tried a heat gun just to see actual vs. indicated temp?
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
