Tachometer issues

[Promax200]

I have a 1992 Laser and I believe I'm having issues with the tach. After shutting the key off the tach will start rising back up. Is it just a wiring issue or is the tach bad itself?

[phillnjack]

When I turn my key off my tach goes back up to around 900 sometimes just 700.
will do it even with the wires off the back.
mine is omc but I am pretty sure my old merc done the same.

[billybob]

It is probably return spring inside tach. If it does that, tach. is probably inaccurate. test tach. in boat, or remove it & take to dealer with tach. tester. some tach,s. it may be normal.

[Dave Strong]

Both my Merc 10,000rpm tach's stay around what rpm the motor was shut off at.

Dave

[FMP]

[QUOTE=Promax200;2986104]I have a 1992 Laser and I believe I'm having issues with the tach. After shutting the key off the tach will start rising back up. Is it just a wiring issue or is the tach bad itself?[/QUOTE

With the battery switch off turn the key on/off again and see if it zeros.