Specs for external "shop" tachometer

[ShoalSurvivor]

I'm looking to pickup a shop tach to adjust idle and set timing on my 2004 Mercruiser 4.3
Will one of these $20 "small engine" tachs to the trick?
Amazon Tach
are they all "pulse" tachs?

I'm looking for a wired version to connect to tach pigtail on the harness (purple / grey), but the all show clamping into or wrapping the spark plug wire.

Recommendations and instructions for hookup would be greatly appreciated!
thanks,
Michael

 

[Scott06]

I'm looking to pickup a shop tach to adjust idle and set timing on my 2004 Mercruiser 4.3
Will one of these $20 "small engine" tachs to the trick?
Amazon Tach
are they all "pulse" tachs?

I'm looking for a wired version to connect to tach pigtail on the harness (purple / grey), but the all show clamping into or wrapping the spark plug wire.

Recommendations and instructions for hookup would be greatly appreciated!
thanks,
Michael

normally a shop tach is for temp hook up either on a plug or the negative side of the coil. if you need a timing light I would get a timing light with a tach. I keep waiting for my old dial back timing light to die (1990 vintage...)

https://www.amazon.com/INNOVA-3568-Digital-Timing-Light/dp/B000EVYGV4/ref=sr_1_1_sspa?crid=CTY29KVHZ6LX&dib=eyJ2IjoiMSJ9.4ZbCTDeQJCogcmmh_p9Xx7jLs6LrWLFxxJljs9Z0QfAzGrLvyXxHiFwoXt9U92rsgorPu3coecyI8kg1JAFynGX7tErMPXe4T-DpXPA-ZZyURvfqGQb57NDp7J6RtsCP0xGRDdYKLYNDbyG0XxjrG0SBFDOdq58Ydc-RDqE-gAtWNwh-djJm8wcxgCzgm6Zc7sfdBmn5YP_tXdtNR-23mbALQUQCC9WzGa3j8jyCIxo990s1hgalUoarxucn-JM7HW-J9qzTrowk2YnxSLBjnvelUy1sll2pXO94cPCrwo0.3kJCbqGVU_zXvBCD-9ZUkw0gO8JIZ8h1LB5fOmkV7vQ&dib_tag=se&keywords=timing+light+with+tach&qid=1773692786&sprefix=timing+light+with+tach%2Caps%2C135&sr=8-1-spons&ufe=app_do%3Aamzn1.fos.9fe8cbfa-bf43-43d1-a707-3f4e65a4b666&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1

I bought this because it also does the KV of the spark which can be helpful when trouble shooting , but its a little pricey. Nice that you just hold it close to the engine and can do any cyl or stroke combo ..

https://www.amazon.com/General-Technologies-Corp-TA100-Tachometer/dp/B000RT9BH2/ref=sr_1_2?crid=1KGD5TBIPVR3G&dib=eyJ2IjoiMSJ9.a2TFglInpkeUAyqGr_294einntqUq932DL1_m0MNrcCSDIBVLD7TCqptPelhFxMmcUDofAesfx65N8miCZ0Vq9Of_ZRuEaQXx-bIEg3LV14ctOYezH-5M0Q9_SR5h7CryqrOYm0CAZPXytbIlw3yvAwTlcmjJ-9AT1Ljqxy-O75xVc6P6CxPdVGHsSg6r2iq4KTptuNxV-t_O2bP_BW1P0jVHzsgJShbqexIOUwXDKmBxeOefYeh_mfePfWHcUxl9bbkg1z0AGdFlwNwgj7JhyU9h4Pt4fTkec5lOf8sark.EutKTvFmrFoIAIh4abqlhFZZEzuGcCFeWrWu4_dwjZE&dib_tag=se&keywords=ignition+analyzer&qid=1773692619&sprefix=igntion+analyzer%2Caps%2C147&sr=8-2

this has a tach feature also is a VM-

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