is the tach signal for a 800/951 tach from the mepm the same as the signal from a 720 stator? like same pulse rate, voltage, ect.

got my 720 spx surf boat running good and want to add a tach, got a large tach from another ski, either an 800 or a 951 boat. its the larger size guage.
has the water temp light incorporated into the bottom of the guage.
i can wire the guage no problem just questioning if i can hook the grey wire to the grey wire that normally sends the tach signal for a 720 tach.

only reason i am wanting to do this is because the guage being larger is easier to read in the surf and it is free and in like new condition.