Devildog Posted July 6, 2018 Report Share Posted July 6, 2018 (edited) Another issue on this 1964 R1 is the tach is inop. after sitting for 20+ years. We reviewed the electric circuits wiring diagram and looked thru the workshop manual, but no procedure to test the tach. I have heard the round sending unit module (in the can under dash) is the usual problem, we have a replacement to install. Any tips or comments ? Thanks for the usual good advice Joe Edited July 7, 2018 by Devildog Link to comment Share on other sites More sharing options...
Gunslinger Posted July 6, 2018 Report Share Posted July 6, 2018 Install the new sending unit and see what happens. More than likely it will start working normally. Don't expect your tach (or speedometer) to be accurate. They weren't particularly accurate when new. The faster you go the more inaccurate they become. Link to comment Share on other sites More sharing options...
avantifred Posted July 7, 2018 Report Share Posted July 7, 2018 Gunslinger does have a valid solution to the problem. Several years ago when I was confronted with an inoperable tach I found D&M Restoration in Greenville, SC. I sent them my tach they installed a restored dial & rebuilt the tach to fully self contained electronics. They also calibrated the tach for accuracy . One fringe benefit is that you will no longer need the sending unit that takes up valuable space under the dash. To say that I love it would be an understatement! Was it a bit pricey YES but results are fantastic & the job is done forever. While you're under the dash it would make things more simple if you also replaced all those red #57 bulbs with super brite red LED's. Then that task is also done forever! Something to consider, right?! Link to comment Share on other sites More sharing options...
Gunslinger Posted July 7, 2018 Report Share Posted July 7, 2018 Absolutely^^^^! You don't want to get behind that dash anymore than you absolutely need to. Once there change out every bulb you can. Link to comment Share on other sites More sharing options...
Devildog Posted July 7, 2018 Author Report Share Posted July 7, 2018 Great idea about the LED bulbs. On one of my old Corvettes (61) I did some under dash work, I debated replacing the bulbs (before LEDs available) They all were the original bulbs, 50+ yrs and 200,000 miles that I have owned it. So I did...you got it, a new bulb failed in less than 6 months. LED are of course no concern. Thanks Joe Link to comment Share on other sites More sharing options...
Jolly-John Posted July 8, 2018 Report Share Posted July 8, 2018 Is there a seller of choice for the red LED dash bulbs? Thanks. John Link to comment Share on other sites More sharing options...
avantifred Posted July 9, 2018 Report Share Posted July 9, 2018 I simply bought them on line. Just make sure you purchase (red of course) "supper Bright" bulbs. The spedo will illuminate the brightest due to the fact there are 2 bulbs (even though the shop book says only one) The vacuum gage will have the worst access BUT you will get it!! Good luck !! Link to comment Share on other sites More sharing options...
Avanti83 Posted July 9, 2018 Report Share Posted July 9, 2018 18 hours ago, Jolly-John said: Is there a seller of choice for the red LED dash bulbs? Thanks. John After a few forays into Ebay for bulbs with sporadic success, I've been buying from these folks with good luck so far. https://www.superbrightleds.com/ Link to comment Share on other sites More sharing options...
Jolly-John Posted July 15, 2018 Report Share Posted July 15, 2018 Thank you, Avanti83 (and avantifred). It's always good to know a "proven" source, per your recommendation. John Link to comment Share on other sites More sharing options...
Mistro Posted July 16, 2018 Report Share Posted July 16, 2018 Ok I'll bite, how many bulbs are required to do the dash (I may be behind the dash shortly and I like the one time approach and forget). Also can you dim leds? Thanks. Link to comment Share on other sites More sharing options...
avantifred Posted July 16, 2018 Report Share Posted July 16, 2018 The Studebaker parts book on page 158 states that the car requires 7 #57R bulbs ( part # 1557882)) DON'T you believe it , you'll need 8 to do the job!! Funny you should ask about the "dimming" requirement ! NO you will NOT be able to dim the LED's I leave the overhead switch on bright. I did this job about 8 years ago perhaps they are dimmable today. The speedometer had 2 lights so it will be the brightest instrument at night. Only install the super bright LED's . Perhaps the newer ones will be brighter!! Good luck The LED in the vacuum gage is the most difficult to reach. You'll need a pain pill after you do this job BUT you'll like the results & know you'll never have to do it again !!! Link to comment Share on other sites More sharing options...
wilkins Posted October 21, 2022 Report Share Posted October 21, 2022 sorry to revive this old topic. Is there any chance you can upload a clear picture of the front and back of the reproduction tachometer sending unit? Link to comment Share on other sites More sharing options...
rufcar Posted November 1, 2022 Report Share Posted November 1, 2022 I know this thread is 4 years old but I have been able to find the high output red led's everyone spoke about? Tkx jim Link to comment Share on other sites More sharing options...
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