Precat Stewart warner replacem Speedo head upgrade group buy
Discussion
Fellow precat owners lend me your ears!!!
After some digging and talking to a precat owner down south , it seems Speedy cables can produce new replicas of the Stewart Warner speedo.
This will have a digital odometer, which can be programmed to your existing mileage.
The speedo will run from a sensor ala the later cars (which would be extra) and do away with the expensive and rare getting gearbox sender.
I have spoke to Speedy today and if 10 of us want one the cost is £180 +carriage+ vat but -30% !!!
This could be an opportunity to get away from an old , difficult to repair and pretty much obsolete speedo head.
Any takers?????
After some digging and talking to a precat owner down south , it seems Speedy cables can produce new replicas of the Stewart Warner speedo.
This will have a digital odometer, which can be programmed to your existing mileage.
The speedo will run from a sensor ala the later cars (which would be extra) and do away with the expensive and rare getting gearbox sender.
I have spoke to Speedy today and if 10 of us want one the cost is £180 +carriage+ vat but -30% !!!
This could be an opportunity to get away from an old , difficult to repair and pretty much obsolete speedo head.
Any takers?????
never got my old speedo returned when they made my new oneTVRJones said:
Maybe, probably, a stupid question - are all pre cat senders off the gear box? Mine is a 92 4.0.I'm guessing this would be.
The alternative I guess being offered is the sensor off the prop feeding the diff?
Again, sorry for a stupid question. Why does the dial need to be replaced when the issue is the availability of the sender? Surely, keep the original gauge which looks right and get an alternative sender only.
I am interested, just need to understand why I might be spending a couple of hundred for a sensor issue. I do take on board that the gearbox one is going to be like hens teeth soon.
Thanks, Rich
Yes, all the precat clocks run from the sender in the LT77 gearbox.The alternative I guess being offered is the sensor off the prop feeding the diff?
Again, sorry for a stupid question. Why does the dial need to be replaced when the issue is the availability of the sender? Surely, keep the original gauge which looks right and get an alternative sender only.
I am interested, just need to understand why I might be spending a couple of hundred for a sensor issue. I do take on board that the gearbox one is going to be like hens teeth soon.
Thanks, Rich
The Stewart Warner speedo head ,to the best of my knowledge, accept an inductive sensor input, also, it is not able to be calibrated by the user.
The replacement proposed head would require an inductive sensor fitted somewhere, most likely picking up on bolts heads on a CV joint,or prop connection.
Calibration is simple, taking into account revolutions per mile of the fitted tyre size and then the amount of bolt seen per revolution(and possibly diff ratio,depending where the sensor is fitted)
This gives a modern speedo (the Stewart warner clocks were not fitted much later than 1992 by TVR) and also negates the gearbox sender.
Right gents, lets try and get this going as we are, I doubt the discount will be anywhere near as favourable but lets see.
You need to fill in the below list. Please copy the format carefully.
Speedy cables cant replicate the speedo needle, so you may need to supply your old one or find a spare from somewhere. (spare tacho???)
Also, let me know if you want speedy to supply a sender or you are going to sort one out yourself. Demon Tweeks sell them for example.
If you require the mileage to be copied from your car, Speedy will require something like a copy of your last MOT.
You need to fill in the below list. Please copy the format carefully.
Speedy cables cant replicate the speedo needle, so you may need to supply your old one or find a spare from somewhere. (spare tacho???)
Also, let me know if you want speedy to supply a sender or you are going to sort one out yourself. Demon Tweeks sell them for example.
If you require the mileage to be copied from your car, Speedy will require something like a copy of your last MOT.
| Name | Mileage copy required | Spare Needle | Sensor required |
| Ant. | Yes | Yes | No |
Barkychoc said:
Just a thought re the needle - how close can they get?
If they supplied 2 needles so you also changed the one in your tacho would you notice?
I'm on the fence at the moment - I'm V8S but I'm not sure how much pain it would be to setup a new speedo drive - can it run from the gearbox sender or am I totally missing the point?
Pretty sure they cant supply exact needles.If they supplied 2 needles so you also changed the one in your tacho would you notice?
I'm on the fence at the moment - I'm V8S but I'm not sure how much pain it would be to setup a new speedo drive - can it run from the gearbox sender or am I totally missing the point?
Kinda missing the point Barky, the point is to get away from the rare and expensive LT77 sender.
Looking at what you have done re:test bed, you will not have a problem mounting an inductive proxy sensor somewhere near the diff/halfshafts.
Have you got the spec of the cal diodes fitted to the SW's?
Edited by Ant. on Sunday 19th September 13:12
UPDATE !!!!!!
Just spoke to Speedy cables again.
They have agreed to do these gauges at -30% for between 5 and 10 of us.
We each need to provide a letter stating the mileage of the vehicle so they can copy the mileage to the new gauge.
I am told the speedo will actually run from the existing LT77 speedo sender, but they would need the old gauge to work out the cal.
They will sell us the inductive type sensor to go with the gauge for 39.55 also -30%.
If you are still running Lucas fuel injection, remember you will need to leave your LT77 sender in place for the ECU signal!!!!
I have 3 SW needles (need one myself) if some dont have a speedo to send and give the needle up.
SO WHO IS UP FOR IT?????
Just spoke to Speedy cables again.
They have agreed to do these gauges at -30% for between 5 and 10 of us.
We each need to provide a letter stating the mileage of the vehicle so they can copy the mileage to the new gauge.
I am told the speedo will actually run from the existing LT77 speedo sender, but they would need the old gauge to work out the cal.
They will sell us the inductive type sensor to go with the gauge for 39.55 also -30%.
If you are still running Lucas fuel injection, remember you will need to leave your LT77 sender in place for the ECU signal!!!!
I have 3 SW needles (need one myself) if some dont have a speedo to send and give the needle up.
SO WHO IS UP FOR IT?????
| Name | Mileage copy required | Spare Needle | Sensor required |
| Ant. | Yes | Yes | No |
| Hoover | Yes | Need to find | No |
Barkychoc said:
So does the sender just need to be close to the bolt - you don't need to have a magnet or anything attached to the prop?
I've secured 3 months contract work today - so I'm in Ant anyway.
Regarding the LT77 gearbox sender what do they need to get the info for that?
I've got an oscilloscope so could possibly assist to work it out.
I'm a bit undecided which route to take - am I worrying about nothing?
Chris
7I've secured 3 months contract work today - so I'm in Ant anyway.
Regarding the LT77 gearbox sender what do they need to get the info for that?
I've got an oscilloscope so could possibly assist to work it out.
I'm a bit undecided which route to take - am I worrying about nothing?
Chris
Edited by Barkychoc on Thursday 23 September 20:57
The sender will just need to be close to the bolt head, as the prop/drive shaft rotates, each bolt head will create a pulse.
Speedy can calibrate the speedo to use the LT77 sender, but the whole idea is to get away from the speedo using that.
As stated before , unless you have an aftermarket ECU, the original ECU may need to recieve the pulse from the LT77 sender to stop the car stalling. Therefore it would have to stay wired.
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