Thread: Tach
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Old 11-26-2017, 10:18 AM   #9
rochepoint
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City: Sidney BC Canada
Vessel Name: RochePoint
Vessel Model: 1985 Cheer Men PT38 Sedan
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Quote:
Originally Posted by Roger Long View Post
We have a circa 1975 engine panel with Motorola tachs. A couple of questions since the subject is on the table:

1) All four of the tach's read slightly differently. Is there an adjustment screw somewhere?

2) The tachs do not move when the engines are started. It is necessary to rev the engines up to about 1500 rpm in neutral when the needles suddenly jump up. After that function is normal even down to minimum idle. Is the normal?
Our tachs do not read upon starting as the alternator does not start producing till the oil pressure comes up, I always thought it was to stop any load on the engine till pressure is up.

Our tachs have a screw on the back that will step the rpm's up or down.
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