GOLD85

well i got a free monster tach from my budie of his race car.but 3 of the wires where riped out(vandals) anyway i need a schematic diagram of it, would your guys know where i can get one

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when the green flag drops the bull$hit stops

pulled the 350 to make way for the 406 wich is in the machine shop. got a comp 282S bump stick with 1.6 rockers. looking at differnt heads right now.Perfomer RPM and holley 650 DP, headers and 3 inch exhust. 3000 stall converter and a built 700r4. shotin for mid 12s next summer

Tim Burgess

What are the colors of the wires coming out of the tach?

Here's what the following two colors generally signify:

Red: +12 volt ignition power
Black: ground

There should be two other wires coming out of the tach, as well; tach input, and dial light power.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

GOLD85

i realize that, but the wires are riped clean from the circut bord

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when the green flag drops the bull$hit stops

pulled the 350 to make way for the 406 wich is in the machine shop. got a comp 282S bump stick with 1.6 rockers. looking at differnt heads right now.Perfomer RPM and holley 650 DP, headers and 3 inch exhust. 3000 stall converter and a built 700r4. shotin for mid 12s next summer

Tim Burgess

If that's the case, then you should be able to easily identify the ground and light traces by ohming them out or following them to the back light. The ground will go to many other places on the PCB, while the light input will go only to the back light. That leaves the other two inputs - the power input will go to many places on the PCB, while the tach input will only go to a few locations. There will probably be a large polarized filter cap on the power input, as well, which should help affirm the wire ID procedure.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph