Autometer Tach

[PMurphy56]

Helped my son install an Autometer tach. in his 92. Located sensor at 8 O'clock position per CBottmley's pic. Worked great right from the get-go,However I still didn't feel lucky enough to go out and buy a lottery ticket. :-laf . There seems to be a little problem on start-up. When the plugs are warming up and the buzzer- is a buzzin-, the tach needle jumps all the way to the right and then back below zero until the engine starts. then it registers the rpm's. What I am concerned about is damaging the movment with all that jerking around. Haven't calibbrated yet. Any ideas?

 

[Makaio]

That erratic movement you're witnessing is simply the tach searching for a signal from the probe. It's normal and nothing to get alarmed about. As far as calibration is concerned, you'll need to get your hands on an optical tach. Any diesel shop and most automotive shops should have one. A piece of inductive tape is placed on the crank pulley and an optical tach (kind of like a timing gun) reads the signal. You adjust the dash tach to the RPM's on the optical tach. You'll need a small precision type screwdriver to adjust that calibration screw on the back of the Autometer tach.

 

[hotram03]

pmurphy what sensor did you use part # and was this the 2967 autometer tach? and you fab a bracket or buy one?