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Old 03-11-2013, 03:41 PM
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TPI speedometer problems

Hi guys, I am having problems installing an electric tpi speedometer. I realize the company is out of business. No surprise there. I should have purchased a mechanical one but now is not the time to flip back. I have tried all the instructions given but with no results. Anyone out there installed one successfully or know someone that has, do you have any hints or problem solving techiques that would help? I have a 350 chevy trans. that I am hoping to connect with. I appreciate the help. Joe

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Old 03-12-2013, 11:15 AM
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gear

Make sure the pulse generator (sender) is installed properly on the transmission. Possibly the gear inside that drives the sender or the square drive pin is missing.
See similar threads.

vicrod
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Old 03-12-2013, 11:49 AM
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Thanks Vicrod, I checked and found others with similar problems. My speedometer never gets off "calculating" until I shut the car off. I will check the sender and inspect for missing parts. If the sender is the problem, can I purchase another one from a different company (gauge) using just a different sender? As of course, TPI must be tired of explaining how their product is supposed to work, and has decided to close. I also read that the pulses should range between 4,000 and 150,000. Is the sender adjustable, and if so how is this accomplished?

Appreciate it, Joe
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Old 03-12-2013, 08:18 PM
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I had the same problem with my VDO speedometer. I was able do a test of the pulse generator and found it to be defective. I replaced it and it now works OK.
First -- I determined that the transmission gears were working and, in fact, turning the sender. There is a gear on the output shaft of transmission that drives the gear on the speedometer device.
Second--I removed the sender from the transmission leaving the wiring connected.
-Connect a voltmeter (analog type works better for this) + lead to terminal #2 and - lead to terminal #3. Turn ON the ignition. You should measure 5-12 volts dc.
-Move the + meter lead to terminal #8. Slowly rotate the square drive input shaft of the sender. The meter should read 0-4-0-4-0-4 volts as the sender generates pulses.
If the meter stays at fixed voltage the sender is defective.
There are vendors that sell these senders on the internet. I believe Daytona is the brand.
Scroll down to see more threads on this issue.

vicrod
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Old 03-13-2013, 01:22 PM
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Thanks Vicrod,

You gave me a lot of things to check on. Things that I would not have thought of. That gives me some options of replacement or repairing. I appreciate the response. Joe
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