This mechanical marine transmission oil pressure gauge with alarm switch or switchgage has a reading of 0 to 300 psi.  With black background, chrome rim and white needle oil pressure reading of your marine transmission is clear.  The switch in the alarm is designed to trigger the alarm system at the level of oil pressure you desired be notified.  Each transmission oil pressure gauge is designed for extreme heavy duty application and comes with a 100% money back guarantee.  All marine transmission oil pressure gauges are shipped direct to you within 24hrs.  This mechanical oil pressure gauge can be used with all marine transmission.  A short sample of the marine transmissions that use this oil pressure gauges is the list below.

Twin Disc marine transmission models: MG509, MG5090, MG5091, MG5111, MG5111A, MG5114, MG5114A, MG514, MG514C, MG516, MG518, MG521 and MG527. 

Allison marine transmission model M: M15, M15L, M15R, M20, M20L, M20R 

Allison marine transmission model MH: MH15, MH15L, MH15R, MH20, MH20L, MH20R, MH30, MH30L, MH30R, MH45, MH45L, and MH45RDP- 20P300 Marine transmission oil.

See Product Installation Instructions