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Fired it today...... a little help please!

FM Former Member
It's alive. Finished all the wiring today, and fired the powerplant. The apparent problem is with the tach..I bought the brazilian gauges from Beck including the tach. With the motor idling, I would gues from the sound about 800-1000 Rpm, the brazilian tach shows 2000Rpm.. I increase the idle to a comfortable rpm ( I would guestimate about 2500-3000), and the silly tach says 5000-5500. So the tach does not seem to be calibrated to the actual RPM of the engine......What can I do? I realize I could complain and ask for a new tach, take it to a speedo shop ( not Palo Alto speed, they would charge 6 times what the gauge cost to calibrate it)

HELP< HELP>HELP

Gclarke
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FM Former Member
It's alive. Finished all the wiring today, and fired the powerplant. The apparent problem is with the tach..I bought the brazilian gauges from Beck including the tach. With the motor idling, I would gues from the sound about 800-1000 Rpm, the brazilian tach shows 2000Rpm.. I increase the idle to a comfortable rpm ( I would guestimate about 2500-3000), and the silly tach says 5000-5500. So the tach does not seem to be calibrated to the actual RPM of the engine......What can I do? I realize I could complain and ask for a new tach, take it to a speedo shop ( not Palo Alto speed, they would charge 6 times what the gauge cost to calibrate it)

HELP< HELP>HELP

Gclarke
WideRidezzzWideRidezzz
Isn't the tach somehow related or reliant on electrical impulses given out through your ignition system? Is this the project with a non-VW engine and such, maybe it's just a compatability issue?

I drove a 356 up in Paradise not long ago that had a similar tach/rev dyslexia...the owner blamed it on being the wrong coil.
Good luck... cruised Gibson Canyon Friday morning. Fall will be good driving weather when you get it ironed out dude.
MM
FM Former Member
VDO ( does this also apply to Brazilian VDO? I don't know) suggests that their tachs are good for 4-6-and 8 cyliner vehicles. I'm guessing that the coil wire would go to a different prong on the back of the tach,,,based on the cylinder configuration of the vehicle. And maybe that's why it's reading sluggish. Does anyone know if that's the case. I took a schematic off the members site as my guide. Is anyone in a position to tell me how the back of your tach is wired??????

Any reply will be halpful, Thanks

Gclarke
oldyeleroldyeler
Hi Mr.Drayer,
If he is useing a South American gauge It won,t have that provison.
However you may still be helpful. take note of the three rezistors in the back of your tack and their color codes. he may be able to add two of them in parelel between the hot and ground on his to correct the voltage. (scuse my spelling) My Buggy is the same way but you simply cut out on rezistor at a time But its so old the color bars are faded.
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