Mercury 402 new tach not working

camaro82

Cadet
Joined
Sep 27, 2009
Messages
11
Hi guys i have installed a new tacho and its not working. The old one wasnt working as well.

It's on the 6p setting
I have changed the rectifier
- the tach signal from the rectifier is to the gauge has continuity
- the ignition power is getting to the gauge
- the wire from the ground on the gauge has continuity to the negative sode of the battery.

There is one issue though, when i connect to the tach signal wire to negative on the battery it shows a continuity value of 480, what does this mean?

Any suggestions as to why its not working.
 
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