95 seadoo xp rpm guage(help!!!!!!!)

[weathers81rm]

hi i just bought a 720 xp thats been settin for 2 years an it runs great but seem to have a problem with the rpm guage, vts guage an my gas guage but im sure the vts module is bad an my sending unit for my gas guage is bad but i have no clue about the rpm. is there a sensor or is the guage bad. if anyone had any advice to help solve some of my problems it would help me alot
thanks