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to you tachometer gurus

M

midnightrider1818

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i tore my tach down and found the problem why it is not working. the tach hand assembly is fine but the circuit board has two burnt resistors. its the two resistors on the one side of the board. not the side with all the other resistors. just the side with two. this is for 71-74 i believe. came out of 73 rr. i cant make out the colors on them. does anybody know what colors these were so i can buy to more.
 
If anyone has a cluster out, they can do an ohm test across them and give you the value. I dont have a tach, Im just an econo-roadrunner!
 
huh. well if anybody knows what colors they are that be perfect. mine are just burnt to a crisp. ill give you the ohm reading on these when i find a couple
 
Just replace it with a tach from Real time Engineering and get a PCG reface for it.
 
426HemiCharger said:
Just replace it with a tach from Real time Engineering and get a PCG reface for it.
Click to expand...

the real time stuff is just a "band aid" the circuit board they sell will make the needle move when you rev it, but it won't be accurate,and if your meter is bad it won't work at all.

if you want it to work and be accurate contact:
 
i got it working right now. the circuit board was fine on it. the two resistors on the one side of the board was burnt. it works great now. i did have to put a dab of solder on one circuit that was cracked. i am not no millionaire and i dont like putting alot of money in something. it works great now. just needed two resistors. all my gauges the coil of wire was burnt in half right where it comes off the supply voltage stud.
 
Dans 68 said:
Upon what do you base your opinion? :confused:

Dan
Click to expand...

I base my opinion on having worked on probably 20 or more tachs with that circuit board , most didn't work (bad meter) the ones that did work were inaccurate 300-500 rpm off in most cases, sometimes even more!,
unless you have a signal generator to bench test, it's pretty much a shot in the dark!
if you're happy with just having the pointer move,and don't care about accuracy (just a show car) then it'll be fine.

i used to work at:
"redline gauge works", and we used to convert quite a few tachs every month,they can also convert the old "Sun" tachs
so you no longer need the "box".
 
Is it that the tachometers themselves were inaccurate, whether you used the original circuitry or a modern solid state (RTE) board, or are you saying that the original boards were/are more accurate that the RTE boards? I've heard that the tic-toc-tach's were notorious for being inaccurate.

And I'd have to say you do have the background to contribute to this subject. :grin:

Dan
 
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