Aftermarket tach wiring?

[AC-MAN]

I bought an Autometer tach to install in my 96 F250 with 351. Instructions say to wire it to a tach signal coming from the electronic ignition. Anyone know where this wire is? Or if there is another place to hook it? Also, where is the best place to install a trans. temp sensor without pulling the pan? Thanks.

[SparkyShaft]

The ignition wire will go to your coils' ground. I routed mine through firewall an stuck the wire in the ground side of plug, if you do it right itll stay forever lol mine has.

[lew52]

tach wire goes to distributer or neg side of coil , temp sensor should go into the side of trans pan , the stock pan may not be thick enough to drill & tap , so you might need to weld a bung on it ....Lew

[Freightrain]

Like mentioned, look at the coil, there is a large two prong plug. One is the neg(if I recall it's brown?). Tap into this wire. With truck running, have someone watch tach as you touch your green tach wire to each wire. When it works, that's the one.

[subford]

You do not have to go into the Ignition system in the engine compartment and through the firewall to get to the tach wire.

The tach wire is located on the back of your Instrument Cluster.
It is a white wire with a pink stripe, #648 (W/PK) on pin #9 of the Black Plug and is unused if you do not have a stock tach.